NOTE: Ensure that louver selection includes
consideration of parameters such as pressure drop
and water penetration.
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Louvers for installation in exterior walls that are associated with the air
supply and distribution system shall be as specified in Section [07600
FLASHING AND SHEET METAL] [10201 METAL [WALL] [AND] [DOOR] LOUVERS]
2.6.7
Air Vents, Penthouses, and Goosenecks
Fabricate Air vents, penthouses, and goosenecks from galvanized steel [or
aluminum] sheets with galvanized [or aluminum] structural shapes. Sheet
metal thickness, reinforcement, and fabrication shall conform to SMACNA
HVAC Duct Const Stds. Accurately fit and secure louver blades to frames.
Fold or bead edges of louver blades for rigidity and baffle these edges to
exclude driving rain. Provide air vents, penthouses, and goosenecks with
bird screen.
2.6.8
Bird Screens and Frames
Bird screens shall conform to ASTM E 2016, No. 2 mesh, aluminum or
stainless steel. Aluminum screens shall be rated "medium-light".
Stainless steel screens shall be rated "light". Frames shall be removable
type, and fabricated from either stainless steel or extruded aluminum.
2.6.9
Radon Exhaust Ductwork
Fabricate radon exhaust ductwork installed in or beneath slabs from
Schedule 40 PVC pipe that conforms to ASTM D 1785. Fittings shall conform
to ASTM D 2466. Use solvent cement conforming to ASTM D 2564 to make
joints. Otherwise radon exhaust ductwork shall be metal as specified
herein.
2.7
AIR SYSTEMS EQUIPMENT
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NOTE: Items in this paragraph may or may not be
required depending on whether field-fabricated air
handling units apply or whether equipment external
to air handling units are used in the distribution
system.
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2.7.1
Fans
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NOTE: Coordinate with paragraph Sound Attenuation
Equipment. Include any applicable noise criteria in
appropriate equipment schedule on the drawings.
Refer to UFC 3-450-02, Design: Noise and Vibration
Control, for vibration criteria. Detail vibration
isolation required on the drawings and include it in
the appropriate schedule.
Design and detail ductwork near air moving devices
to minimize system effect on the fans in accordance
with AMCA 201. Add system effect to the duct
SECTION 15895
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