Const Stds. Access doors shall be provided upstream and downstream of air
flow measuring primaries and heating and cooling coils. Doors shall be
minimum 375 by 450 mm 15 by 18 inches, unless otherwise shown. Where duct
size will not accommodate this size door, the doors shall be made as large
as practicable. Doors 600 by 600 mm 24 by 24 inches or larger shall be
provided with fasteners operable from both sides. Doors in insulated ducts
shall be the insulated type.
2.10.3.2
Fire Dampers
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NOTE: The designer must indicate on the drawings
the location of each fire damper and details of the
damper installations. Fire dampers must be provided
in accordance with NFPA 90A. Three-hour rated fire
dampers must be specifically identified on plans.
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Fire dampers shall be 1-1/2 hour fire rated unless otherwise indicated.
Fire dampers shall conform to the requirements of NFPA 90A and UL 555.
Fire dampers shall be automatic operating type and shall have a dynamic
rating suitable for the maximum air velocity and pressure differential to
which it will be subjected. Fire dampers shall be approved for the
specified application, and shall be installed in accordance with their
listing. Fire dampers shall be equipped with a steel sleeve or adequately
sized frame installed in such a manner that disruption of the attached
ductwork, if any, will not impair the operation of the damper. Sleeves or
frames shall be equipped with perimeter mounting angles attached on both
sides of the wall or floor opening. Ductwork in fire-rated floor-ceiling
or roof-ceiling assembly systems with air ducts that pierce the ceiling of
the assemblies shall be constructed in conformance with UL Fire Resist Dir.
Fire dampers shall be [curtain type with damper blades] [in the air
stream] [out of the air stream] [or] [single blade type] [or] [multi-blade
type]. Dampers shall not reduce the duct or the air transfer opening
cross-sectional area. Dampers shall be installed so that the centerline of
the damper depth or thickness is located in the centerline of the wall,
partition of floor slab depth or thickness. Unless otherwise indicated,
the installation details given in SMACNA Install Fire Damp HVAC and in
manufacturer's instructions for fire dampers shall be followed.
2.10.3.3
Splitters and Manual Balancing Dampers
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NOTE: Designer will indicate all volume dampers on
the drawings. Diffuser and register volume dampers
will not be used for balancing.
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Splitters and manual balancing dampers shall be furnished with accessible
operating mechanisms. Where operators occur in finished portion of the
building, operators shall be chromium plated with all exposed edges
rounded. Splitters shall be operated by quadrant operators or 5 mm 3/16
inch rod brought through the side of the duct with locking setscrew and
bushing. Two rods are required on splitters over 200 mm 8 inches. Manual
volume control dampers shall be operated by locking-type quadrant
operators. Dampers and splitters shall be 2 gauges heavier than the duct
in which installed. Unless otherwise indicated, multileaf dampers shall be
opposed blade type with maximum blade width of 300 mm 12 inches. Access
doors or panels shall be provided for all concealed damper operators and
SECTION 15566A
Page 17
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