Square with rounded corners bluebeam

STUDENT AND ACADEMIC SERVICES BUILDING

NAU Project No.: 09.600.141

Project Program Report

April 21, 2014

NAU Student and Academic Services Building: Project Program Report (April 21, 2014).

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Prepared by:

DWL Architects + Planners, Inc. 2333 N. Central Avenue, Phoenix, Arizona 85004 P: (602) 264-9731 F: (602) 264-1928 www.dwlarchitects.com

NAU Student and Academic Services Building: Project Program Report (April 21, 2014).

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TABLE OF CONTENTS

Cover -

Authorship 1

Table of Contents 2

01 Overall Project Information 3

02 Architectural Narrative 4

03 Structural Narrative 8

04 Mechanical and Plumbing Narrative 10

05 Electrical Narrative 16

06 LEED Certification Summary 19

07 Program summary of spaces: 21

Table 1: Net-assignable Area

Table 2: Non-assignable Circulation and Utility areas

Table 3: Net-assignable and Gross Area Calculations

Appendix 1: Architectural Outline Specifications

Appendix 2: Draft Program - Space requirements by room

Appendix 3: Draft Program – Furniture Schedule

Appendix 4: Detailed LEED Scorecard – Schematic Design.

Appendix 5: AV Systems:

AV Systems Schematic Design Quote

Network and Electrical Considerations

Appendix 6: Preliminary Estimated Energy Consumption Summary.

NAU Student and Academic Services Building: Project Program Report (April 21, 2014).

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01. OVERALL PROJECT INFORMATION

Project Team:

American Campus Communities 12700 Hill Country Boulevard, Suite T-200 Austin, Texas 78738 Construction Manager: Hardison Downey Construction 6150 N. 16th Street, Suite A Phoenix, AZ 85016 Architectural: DWL Architects + Planners, Inc. 2333 N. Central Avenue Phoenix, AZ 85004 602-264-9731 | 602-264-1928F Civil/ Landscape: The WLB Group 500 N. Beaver St. Flagstaff, AZ 86001 Structural: Caruso Turley Scott Structural Engineers 1215 W. Rio Salado Pkwy, Suite 200 Tempe, AZ 85281 Mechanical, Plumbing & Electrical: LSW Engineers Arizona, Inc. 2333 W. Northern Avenue. #9 Phoenix, AZ 85021 Audio Visual: CCS Presentation Systems / Southwest 17350 N. Hartford Dr. Scottsdale, AZ 85255

Project Description:

The proposed Northern Arizona University campus Student and Academic Services Building is an approximately 94,000 square foot academic building that will include a One Stop Students Service Center, Undergraduate Admissions Center, an auditorium, mathematics computer lab, classrooms, department offices, faculty offices, conference rooms, restrooms, circulation, support facilities, and interior mechanical spaces. Building systems components will be housed in a roof top penthouse and dedicated facility service access rooms.

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02. ARCHITECTURAL NARRATIVE

General Description: The proposed Northern Arizona University campus Student and Academic Services Building is an approximately 94,000 square foot academic building located at 1101 S. San Francisco Street in Flagstaff, Arizona. The new structure will be constructed abutting the west elevation of the existing San Francisco Street Parking Garage. Program facilities to be incorporated will include a One-Stop Students Service Center, Undergraduate Admissions Center with an 152 person auditorium, a Mathematics Emporium / computer lab, 3-5 classrooms, 4 department offices, 152 faculty offices, 5 conference rooms, restrooms, circulation, support facilities, and interior mechanical spaces. Building systems equipment and service pathways will be housed in a roof top penthouse, ground floor service access rooms and in a dedicated utility bay separating the new program areas from the existing parking structure. Program Configuration: The university’s approved space program for the new facility calls for the development of five primary functional use areas. The locations of these areas within the building are predicated upon the physical capacity, occupancy type and means of access/egress required to serve the intended program uses. Initial discussions between the design team and departmental stakeholders representing the One-Stop Student Center, Under Graduate Admissions and Math Emporium programs identified a three tier hierarchy for the functional uses and internal circulation requirements. Placement of the One-Stop Students Center and UG Admissions on the building’s first level was deemed essential to satisfying the anticipated service needs of both current and future students seeking assistance. The Math Emporium with its high volume usage, open instructional commons, sub-divisible classrooms, adjacent staff offices and desired external views logically positioned itself on the second level. The ACC project team was requested to develop a minimum of two design concepts for the Academic Departments space. The first concept adjusts the size of the departments’ development program to fit within a three story facility to come as close as possible to achieving the mandated 80,000 sf. maximum gross building area. The second concept increases the size of the gross building area as required to accommodate the Academic Department’s office space program in a four story facility. A 5,000 sf. mechanical rooftop penthouse sits atop the easternmost edge of the otherwise four story building structure. Conceptual Building Design: It is understood that the design for this project must create an appropriate identity for Northern Arizona University while respecting the context of the adjacent campus districts, the surrounding vocabulary of architectural language and the precepts contained in the Northern Arizona University Campus Master Plan. In support of this prerequisite the following narrative describes the underlying abstract for the schematic design of this project. The conceptual design for the Student and Academic Services Building project closely aligns the functional hierarchy of its programmed interiors with the articulated massing of its external envelope. The building’s exterior identity draws its aesthetic inspiration from the biologic forms of the area’s extensive Ponderosa Pine Forests and the architectural features of the existing campus facilities. The design for the new SAS Building brings together and visually celebrates the unique attributes of the NAU campus’s urban and natural environments. Site Improvements: Nestled between the imaginary lot lines of the Beaver Street transit spline (West), the existing San Francisco Street Parking Structure (East), the existing Bookstore (North) and Blome Drive (South), the site selected by the University significantly influences the architectural design. With its physical boundaries defined by adjacent structures, campus underground utilities paths, pedestrian circulation and vehicular right of ways, the resulting volume can accommodate a buildable volume approximately 356’ in length, 86’ wide and 78’ in height. The conceptual design of the first and second floor levels serve to

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avoid and/or minimize the project’s impact upon the project site’s existing construction. The building’s ground floor coverage is significantly reduced by supporting a portion of the second floor atop 2-story tall columns spanning beyond the existing diagonal sidewalks initially used to define the north and south limits of the project site. To better facilitate the new project’s development, the pedestrian entrance serving the parking structure will be relocated using the existing partial wall opening through the north side of the garage. A 1:20 sloped sidewalk serving both the parking structure’s new entrance and the SAS Building’s adjacent egress stair will extend to the existing University Bookstore sidewalk system. Beginning from ground level, the building primary entrances are accessed by ascending nominally sloping sidewalks, wide stairways or code compliant ramps. The first floor forms an elevated base rising five feet above the adjacent existing sidewalks that lead to the Bookstore. The One-Stop Students Service Center is located at the structure’s north end with its own separate building entrance while the Undergraduate Admissions Center with its attached auditorium occupies the south end. The new concrete sidewalk leading to the building’s main entrance near the center of its west elevation will required construction of minor retaining walls to restrain the sides of the ramp. This also serves to retain the existing five foot landscape strip supporting seasonal snow removal efforts. The existing campus domestic water & fire hydrant line, abandoned 4” steam line, water service line feeding the parking garage and the storm drain running immediately adjacent to sidewalk along the west edge of the project site will require partial relocation to facilitate the new construction. General Landscaping: The quantity of the site landscaping will be commensurate with that found throughout the general campus. Plant selections shall include shade tolerant species in the areas located adjacent to the building entrances, along the edges of south special events plaza and beneath the elevated portions of the second floor level. Site improvements will likely consist mostly of planting soft-scape and some hardscape materials with possible relocation of the bus stop amenities and bicycle storage components near the north end of the project site. Building Program Design: The first floor forms an elevated base rising five feet above the adjacent existing sidewalks that lead to the Bookstore. The One-Stop Students Service Center is located at the structure’s north end with its own separate building entrance while the Undergraduate Admissions Center with its attached auditorium occupies the south end. The main building entrance is located on the west between these departments and leads to a large central lobby from which elevators and a grand staircase circulate users to the higher floors in the building. A special events plaza shaded beneath the upper floors of the building and directly accessible from the auditorium fills out the south end of the first floor level. The second floor is defined by the open character and various scales of the functions for which it is intended. The primary academic spaces within the Math Emporium include three large sub-dividable classrooms at the north end, an enclosed testing lab, a sub-dividable tutorial room and the large open computer center with 250 workstations occupying the major portion of the south end. The second floor provides numerous small rooms for formal study as well as casual socialization spaces to enhance opportunities for incidental and cross-disciplinary learning. The third and fourth floors are configured to accommodate two general academic department office areas. Both floor plans hold the same number of department, staff and faculty occupants with only minor positional variations associated with area differences between the large/small and twin medium conference room sizes. Shared department amenities include large lobby waiting areas, open floor lounges with kitchenettes, various sized informal socialization spaces as well as numerous vision panels and skylights introducing natural light deep within the building’s internal corridors.

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Shell Construction: The primary building structure will consist of drilled caisson foundations supporting continuous concrete grade beams along the perimeter, concrete slab-on-grade on the First Floor and steel moment frame with concrete/metal decks at all Floors above. The first floor level will be raised above the 100 year flood plain record to minimize potential issues associated with flooding. Geotechnical remediation the existing expansive soil conditions will be required. Currently, the final determination regarding the selection of the building’s exterior wall and roof assemblies remains pending. It is anticipated, that one or more of the following building systems will be utilized to enclose the shell structure: a combined fire rated separation wall with one wall constructed of using a full height 1hr. gypsum shaft wall assembly and the other a partial 1hr. gypsum shaft wall infilling the openings in the precast concrete wall panels in the west elevation of the parking garage. Construction assemblies and materials shall also include pneumatically applied cementitious fire proofing on all structural steel members; typical metal pan tread stair assemblies will be used for the north and a south emergency stairways. The building’s exterior walls shall be constructed utilize both integrally colored cementiticious fiber and/or prefabricated metal rain screen panels mechanically fastened over a continuous HPS insulation system or interlocking insulated panel with surface waterproofing; insulated glass/aluminum storefront window systems (single story) at all building entrance; (2) hydraulic elevators co-located in a single hoistway with provision for the addition of a future third elevator); will insulated glass/aluminum storefront (fixed and operable) at all exterior window locations; 4’x12’ pre-manufactured roof skylights; structural roof decking sloped to drain; R-25 minimum 2” continuous rigid insulation and a “KEE” waterproof membrane system or other built-up system as required by the University. Exterior Elevations Design: As described briefly above, the building’s exterior design is being developed as an abstract portrayal of the surrounding region’s Ponderosa Pine Forests. The rise and fall of forest pathways through the local topography is depicted by numerous sidewalks, ramps and stairways leading up to the building’s exterior entrances and the elevated events plaza to the south. The exterior walls surrounding the first floor will incorporate vertical bands of glass interspersed with colored cementitious fiber and folded seam metal panels to visually represent the trunks of varying widths extending deeper into the forest. These elements enliven the forest appearance by visually interrupting the views of the activities occurring within the One- Stop and Undergraduate Admission spaces when viewed from the exterior. The degree of transparency decreases as the external wall treatments rise up to the second floor level. The intermittent placement study nooks, socialization spaces, and the large conference room along the west wall as well as the Math Emporium’s open computer center represent the natural voids between the opaque clusters of low hanging pine boughs. Different window sizes and groupings used to introduce natural light into these spaces are also separated by larger areas of opaque wall panels scribed with diagonal joint patterns to further enhance the conceptual image of the low forest canopy. The nominal amount of external wall transparency is reached on the third and fourth floors housing the Academic Department Offices. Here, the semi-sequential placement of much narrower operable office windows and modest lobby/study nooks fixed window openings allow natural light and ventilation filter into all of the exterior offices. Each opening is surrounded by opaque field panels scribed with more complex diagonal joint patterns arranged to convey both an image pattern of individual pine needles and to represent the dense upper crown of the forest canopy. Building Interiors: The anticipated interior finishes will consist of the following assemblies: a custom patterned .376” thick ‘epoxy terrazzo’ topping, ground and polished throughout the building’s ground floor lobby area; carpet flooring tiles used throughout the SAS and UA office service areas, the Math Emporium and Academic Department areas and all upper elevator lobbies; ceramic flooring and wall tiles in the restrooms; hard trowel concrete in the mechanical penthouses, utility service rooms and enclosed exit stairs, painted

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gypsum wall board enclosing all office and classroom spaces; elevator shafts and 2hr. rated exit stairs will be enclosed in painted gypsum wall board; acoustic sound paneling at select locations in the auditorium; fiber sound insulation within all walls surrounding the auditorium, testing, conference, restroom; mechanical and electrical rooms; suspended acoustic ceiling systems used throughout the facility with framed gypsum wallboard soffits and ceiling profiles at select locations (i.e., elevator lobbies & academic department conference rooms). The auditorium’s vista vision windows and all office windows shall be equipped with operable roll down window assemblies. Summary: The above narratives describe the primary design concepts and supporting construction technologies developed by DWL Architects + Planners and its consultants during the initial programming stages for the schematic design of this project. The building’s secondary sub-systems, components, materials and exposed finishes remain conceptual in nature and subject to change pending future input from various project stakeholders and combined development team (i.e., NAU, American Campus Communities, Hardison Downey, DWL, LSW, CTS, WLB, CCS and Speedie Associates). Working closely together, the members of this group will create a project that is distinctive and worthy of Northern Arizona University’s increasing prestige and which will faithfully serve institution for many decades to come.

CARUSO TURLEY SCOTT consul t ing structura l engineers

YOUR VISION IS OUR MISSION

PARTNERS

Richard D. Turley, PE

Paul G. Scott, PE, SE

Sandra J. Herd, PE, SE

Chris J. Atkinson, PE, SE

Thomas R. Morris, PE

Richard A. Dahlmann, PE

1215 W. Rio Salado Pkwy. Suite 200 Tempe, AZ 85281 T: (480) 774-1700 F: (480) 774-1701 www.ctsaz.com

April 18, 2014

Mark Dee, AIA DWL Architects 2333 N. Central Ave Phoenix, AZ 85044

RE: NAU Student and Academic Services Building (SD-Structural narrative) 1101 S San Francisco St, Flagstaff AZ, 86011 CTS Job No.: 14-122

Schematic Design Structural Narrative:

CODE:

This 4 story steel building with a penthouse at the roof will be design under the 2009 International Building Code.

STRUCTURAL SYSTEM:

Roof: The structural system at the roof and penthouse, consist of steel joists over steel deck supported by steel beams (WF-Sections) located at main grids and at cantilever areas.

Floors: The structural system at all floors consist of concrete topping over steel deck, supported by steel beams and wide flange steel columns located at all main grids. This composite system consists of 3” of normal weight concrete over 3” steel metal deck with 6x6xW2.9xW2.9 W.W.F. centered in the slab (6” total depth). Beams at all floor levels range from 16” to 30” in depth, and steel columns sizes will range between 12” and 14”.

Floor Level: The ground level will consists of a 5” concrete slab with #4 bars spaced at 18” o.c. each way over 4” of ABC, over a vapor barrier. Due to the type of soil under the proposed building, a stabilization process will be required (Refer to geotechnical report for further information).

Foundation System: The system for the building consists of concrete caissons (deep foundation). A caisson will be located at all main grid columns, elevators and stairs. The caissons will vary in size and in length depending on the final findings of pilot holes currently being done at the site, as well as recommendations from the soil engineer.

CARUSO TURLEY SCOTT consul t ing structura l engineers

YOUR VISION IS OUR MISSION

PARTNERS

Richard D. Turley, PE

Paul G. Scott, PE, SE

Sandra J. Herd, PE, SE

Chris J. Atkinson, PE, SE

Thomas R. Morris, PE

Richard A. Dahlmann, PE

1215 W. Rio Salado Pkwy. Suite 200 Tempe, AZ 85281 T: (480) 774-1700 F: (480) 774-1701 www.ctsaz.com

Building Lateral System: The lateral system of the building consists of steel Moment Frames (steel beams and steel columns). This particular system was selected by the design team with the intent that it will provide an open space. All Lateral columns will then be supported by concrete caissons.

End of Narrative

If you have any questions regarding this schematic design structural narrative, please call our office at (480) 774-1700.

Respectfully submitted,

Caruso Turley Scott, Consulting Structural Engineers.

2333 W Northern Ave, #9 . Phoenix, Arizona 85021-9334 . Telephone 602.249.1320 . Facsimile 602.336.3276

NAU STUDENT AND ACADEMIC SERVICES BUILDING

MECHANICAL, PLUMBING, & FIRE PROTECTION

SCHEMATIC DESIGN NARRATIVE The New Northern Arizona University campus Student and Academic Services Building will be an approximately 94,000 square foot academic building that will include an auditorium, mathematics computer lab, classrooms, faculty offices, restrooms, circulation, support facilities, and a mechanical penthouse. Facility mechanical system components will include chilled water variable-air-volume (VAV) air handling units with VAV boxes with hot water heat, perimeter finned tube convectors, steam to hot water heat exchangers, and heating hot water pumps. All mechanical, plumbing, and fire protection systems will be designed to meet NAU’s design guidelines and specifications. The specific design criteria to which the mechanical systems have been designed at the schematic design level are as follows: Summer Outdoor: 90°F db, 65°F wb Summer Indoor: 78°F Winter Outdoor: -20°F Winter Indoor (Mechanical Rooms): 50°F Winter Indoor (All Other Rooms): 72°F For energy modeling purposes, we have assumed setbacks of 5°F above cooling and 5°F below heating during unoccupied hours. Preliminary Envelope Values: Roofs Insulation Entirely Above Deck U=0.048 Walls Above Grade Steel Framed U=0.064 Floors Mass U=0.074 Vertical Glazing Metal Framing (All Other) U=0.55, SHGC=0.40 Skylight w/ Curb Plastic, 0-2% of Roof U=1.10, SHGC=0.77 These envelope values are based on ASHRAE 90.1 minimum values for preliminary energy modeling and load calculation purposes. Once a more detailed energy model is developed and compared to the ASHRAE 90.1 Baseline, these numbers will be adjusted to achieve the desired Energy and Atmosphere (EA) credits associated with LEED. These calculations will be performed using actual utility cost data from the campus steam and chilled water plants that will serve this building, as LEED EA calculations are based on energy cost savings. As the energy model is further developed, these energy costs will be compared to the ASHRAE 90.1 Baseline model to allow the design team to further evaluate the building’s envelope, mechanical systems, and electrical systems to determine the most effective energy cost savings approach, while still remaining cognizant of the building’s construction budget. Building Mechanical Piping Systems The building’s mechanical systems will be served by the campus chilled water, and the campus steam and condensate piping distribution systems.

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Six inch chilled water supply and return piping will be extended to the building from the campus chilled water distribution system with 15 psig of differential pressure at the building entrance. Tertiary chilled water pumps will not be provided, as all of the chilled water pumping on campus is done at the central chilled water plant. Chilled water will be supplied to the building at 42°F during the summer with a 20°F split. During the winter, the chilled water will be supplied to the building at 55°F, so the system has also been evaluated and sized for internal cooling loads during the winter with an elevated chilled water supply temperature. The chilled water piping will serve the chilled water cooling coils in the variable-air-volume (VAV) air handing units located in the mechanical penthouse. The chilled water system, including piping, valves, coils, strainers, etc., has been sized large enough so that the 15 psig that is being supplied to the building is adequate to serve the building during peak load conditions. A new 5” steam line and a 2” steam condensate return line will be supplied to this building to serve the building’s heating and domestic hot water systems. This new 60 psig steam line and condensate return line will connect to the existing 60 psig steam main and steam condensate main located in the steam tunnel that is located just west of the Transit Spine or Beaver Street. The new 5” steam line and new 2” steam condensate line will connect to the existing 10” steam line and 6” steam condensate return line in the existing tunnel. These new pipes will be routed to the building in a sloped concrete pipe chase that is shown on the civil drawings. The piping will be pitched toward the existing tunnel where a steam trap will be provided to remove condensate from the new steam line that serves the new building. This trap will be located in a new concrete vestibule that is being added to the existing tunnel for ease of construction and maintenance. Once the piping is extended up into the building’s Heat Exchanger Room, it will serve redundant shell and tube heat exchangers and redundant domestic water heaters. The steam pressure will be reduced from 60 psig to 15 psig via a one-third, two-thirds arrangement of Fisher 92B pressure reducing valves. A bypass will be included in this arrangement for maintenance considerations. An 8”, 15 psig steam line will be extended to the shell and tube heat exchangers. Two 100% redundant, 6,800 MBH Bell & Gossett QSU 14 4-2 shell and tube heat exchangers will be provided to handle the building’s heating requirements. Two 350 GPM, 100% redundant heating hot water pumps with 35 feet of head will be provided in this room and will be equipped with variable frequency drives (VFDs) to allow the pumps to vary speeds based on the building’s heating load. Basis of design will be Bell and Gossett 1510 base- mounted, end-suction pumps. The steam condensate from the heating hot water heat exchangers and the domestic water heat exchangers will flow to a condensate return unit in the same room. This unit will be ventilated to the outside and will have redundant condensate return pumps which will pump the condensate at 35 GPM and 50 psig back to the main campus condensate line located in the existing steam tunnel. The heating hot water system will serve hot water heating coils in the VAV air handling units, single duct variable-air-volume terminal units, miscellaneous cabinet and unit heaters in mechanical spaces, stairways, and entry vestibules, and the snow melt systems. Hot water finned-tube convectors will also be utilized in all perimeter spaces. Due to the high percentage of outside air that is required by ASHRAE 62.1-2007 for the air handling units, the heating hot water loop will serve plate and frame heat exchangers located in the penthouse. These heat exchangers will transfer heat from the building’s heating hot water loop to 40% propylene glycol loops that will serve the heating coils in the air handling units. This will allow the majority of the building that does not have freezing concerns to run off of the standard heating hot water loop, while keeping the glycol loops located in the penthouse. Each air handling unit will be provided with a separate heat exchanger and glycol loop, consisting of redundant in-line Bell & Gossett pumps, sized for 90 gpm and 25 feet of head. One common glycol feed system will supply both loops. Per NAU guidelines, run-around heat recovery loops have been provided for both air handling units since the outside air quantities exceed 50% of the total airflow. These coils will be provided with heat recovery pumps sized at approximately 150 GPM and 40 ft of head. Since demand control ventilation is being used on this building, an energy simulation will be run to compare the effectiveness of the heat recovery coil

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versus the fan and pump energy penalty that will be seen year-round. It is our opinion that the heat recovery coil may end up penalizing the overall efficiency of the system since the unit will have an air-side economizer and the fans would be seeing the extra pressure drop year-round. Once the energy model is further developed, this simulation will be shared with NAU for their input. An hydronic snow-melt system will be provided to serve the north entrance of the building. The area served by this system will be approximately 1,500 square feet and will be served by a snow melt manifold located on an adjacent exterior wall. Flexible snow-melt tubing will be run from the manifold into the adjacent concrete slab where it will heat the concrete slab to melt the snow. In a remote room, a small plate and frame heat exchanger, a snow melt pump, and a glycol feed unit will be provided to serve the snow melt manifold. The plate and frame heat exchangers will transfer heat from the building’s heating hot water loop to the 50% propylene glycol snow melt loop. Snow melt sensors will be provided in the slab so that the system will only run when appropriate temperatures and moistures are detected. As requested by NAU, an alternate bid number should be provided for providing an additional snow melt system that will serve approximately 2,000 square feet along west side of the building. Chilled and heating hot water piping within the building envelope will be Schedule 40 steel or Type L copper tubing with either threaded, welded, or brazed joints depending on the size of the pipe and application. Grooved or press-fit fittings will not be acceptable. Direct buried chilled water piping will be specified by the civil engineer. Steam piping will be Schedule 80 steel pipe with welded and flanged joints for piping larger than 2” and threaded joints for piping 2” and smaller. Steam condensate piping will be Schedule 80 steel piping with welded and flanged joints for piping larger than 2” and threaded joints for piping 2” and smaller. Chilled water, heating hot water, and steam and condensate piping will be insulated with pre-formed mineral fiber pipe insulation with thicknesses that meet or exceed the local energy code. The steam piping and chilled water piping entering the building will be supplied with BTU meters for tracking through the building automation system. Air Handling and Air Distribution System Two central 40,000 CFM VAV air handling units will be located in a mechanical penthouse on the roof, with one unit serving the north half of the building and one unit serving the south half of the building. The air handling units will consist of a return plenum, a relief fan array controlled by a redundant unit mounted VFDs without bypasses, energy recovery coils located in the supply and relief air stream, an economizer section with dampers and controls, side loading pre-filter (4” pleated MERV 7) and side loading final filter bank (6” rigid MERV 13), heating and chilled water coils with access on the discharge side of each, a freezestat located on the leaving side of the hot water coil, and supply fan array controlled by redundant unit mounted VFDs without bypasses. The supply and return fans will have air flow measurement capabilities. The chilled water coil and the heating hot water coil in these air handlers will have two-way control valves that will modulate to maintain leaving air temperatures. The heating hot water coil will have a 40% propylene glycol loop as discussed in the previous piping section. The units have been selected and sized with a 450 fpm velocity across the cooling coil per NAU guidelines. The casing of the units will be double-wall, non-porous 18-gauge construction. Access will be provided all around the air handling units for coil, fan, filter, and damper access. Basis of design for air handling units will be Temtrol, with Energy Labs, Huntair, and Haakon listed as equivalents. The air handling units will be ducted to intake and relief air louvers. The intake louver will provide outside air to the air handling unit. A 42” deep plenum will be provided on the penthouse side of the louver to allow any fly snow to fall out of the air stream. The bottom of the plenum will be provided with a small electric snow melt system with the snow melt system only activated if temperature and moisture sensors detect snow in the plenum. A drain will be provided in this plenum to allow any melted snow to drain. The outside air duct to the unit will connect to the plenum as high as possible in order to minimize the potential for snow getting into the air handling unit. Air flow measurement stations will be provided in the outside air

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