c.
Ductwork within mechanical equipment rooms;
d.
Outdoor ductwork;
e.
Ductwork within 1.50 meter 5 feet of heating or cooling coils;
f.
Vertical risers more than two floors;
g.
Kitchen or exhaust ductwork; and
h.
Ductwork in concrete or buried below grade.
]3.1.1.8
Packing
Pack spaces between sleeve or opening and duct or duct insulation with
mineral fiber.
[3.1.1.9
Security Bars
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NOTE: Use this paragraph for brig facilities only.
**************************************************************************
Install security bars at ductwork penetrations of roof and at ductwork
penetrations of security walls and floors where duct height or width exceeds
150 mm 6 inches.
]3.1.2
Duct Hangers and Supports
**************************************************************************
NOTE: Delete the sentence for seismic restraints if
the project specifications include Section 15070,
"Mechanical Sound, Vibration, and Seismic Control."
The designer must provide typical seismic restraint
details on drawings.
**************************************************************************
SMACNA HVAC Duct Const Stds, Section 4. [Provide seismic restraint
complying with SMACNA Seismic Restraint Mnl.] Attach supports only to
structural framing members and concrete slabs. Do not anchor supports to
metal decking unless a means is provided and approved for preventing the
anchors from puncturing the metal decking. Where supports are required
between structural framing member, provide suitable intermediate metal
framing. [Provide retainer clips where C clamps are used.]
3.1.2.1
Flexible Ducts
Support ducts by hangers every one meter 3 feet, unless supported by
ceiling construction. Stretch flexible air ducts to smooth out
corrugations and long radius elbows. Provide minimum length to make
connections.
3.1.2.2
Flexible Connectors
Provide flexible connectors between fans and ducts or casings and where
ducts are of dissimilar metals [as indicated]. For round ducts, securely
fasten flexible connectors by zinc-coated steel clinch-type draw-bands. For
rectangular ducts, lock flexible connectors to metal collars.
SECTION 15810N
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