3.1.3
Inspection Plates and Test Holes
Provide, where required, in ductwork or casings for all balance
measurements. If possible, test holes should be located at least 7.5 times
diameters downstream from a disturbance. Extend cap through insulation.
3.1.4
Acoustical Duct Lining
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NOTE: Do not use insulation liners for ductwork at
infectious areas in hospitals, such as operational
suites, nurseries, pathological facilities,
intensive care units, and surgical wards; use
factory prefabricated sound attenuators instead.
For brig facilities, fibrous glass ductwork should
not be used in inmate housing area, areas accessible
to inmates, nor areas with concrete, gypsum board,
or plaster ceilings. Do not use fibrous glass ducts
within 300 mm 12 inches of electric or fuel fired
heaters.
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Apply lining in cut-to-size pieces attached to interior of ducts with
fire-resistant adhesive. Top and bottom pieces shall lap the side pieces.
Secure pieces together with welded pins or clips. Do not distort ducts,
burn through or mar the finish surface of ducts. Pins and washers shall be
flush with the surface of duct liners. Seal breaks and punctures of
duct-liner coating with fire-resistant adhesive. Coat exposed edges of the
liner at duct ends and other joints where lining will be subject to erosion
with a heavy brush coat of fire-resistant adhesive, to prevent delamination
of glass fibers.
3.1.5
Sound Attenuators
Provide sound attenuators in the discharge duct of each high-pressure fan
[operating at a pressure above 1000 Pa 4 inch water gage] [and] [as
indicated]. For each system, provide sound attenuators to ensure that the
combination of air system equipment and sound attenuation comply with the
designed sound levels.
3.1.6
Flashing
[Section 07600 FLASHING AND SHEET METAL.] [Provide waterproof flashing
where ducts pass through exterior walls and roofs.]
3.1.7
Cleaning of Ducts
Remove all debris and dirt from ducts and wipe clean. Before installing
air outlets, force air through entire system at maximum attainable velocity
to remove accumulated dust. Provide temporary air filters to protect
ductwork which may be harmed by excessive dirt. For large systems, clean
duct with high power vacuum machines.
[3.1.8
Security Grilles, Registers, and Diffusers
[a.
Security grilles and registers with back mounting flange shall be
secured to ductwork as indicated.]
[b.
Security grilles without back mounting flange shall be secured to
SECTION 15810N
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