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4 /13 IOM-CRD0763INST
" C o m p l e t e A i r C o n t r o l a n d D i s t r i b u t i o n S o l u t i o n s . "
w w w . n a i l o r . c o m
Calgary, Canada
Tel: 403-279-8619
Fax: 403-279-5035
Houston, Texas
Tel: 281-590-1172
Fax: 281-590-3086
Toronto, Canada
Tel: 416-744-3300
Fax: 416-744-3360
Las Vegas, Nevada
Tel: 702-648-5400
Fax: 702-638-0400
Page 2 of 2
SUPPLEMENTARY INSTALLATION INSTRUCTIONS
FABRICATION OF STEEL PLENUM
Internal
Insulation
Insulation Detail
LISTED SIZE
W x H
1"
(25)
1/2" (13)
INTERNAL INSULATION
LISTED SIZE W x H
1"
(25)
1/2" (13)
FASTENER
CRD12
DAMPER
11" (279) MAX
2" (51) MAX
W + 2" (51)
H
W
H+2" (51)
NOTES:
1.
The steel plenum box and top shall be a minimum of 28 ga. (0.47) galvanized steel fastened together per SMACNA HVAC
Duct Construction Standards, 4" (102) OC.
2.
The outlet collar shall be 28 ga. (0.47) and shall be undersized 1/8" (3) small than the diameter of the damper frame.
3.
The damper shall be attached to the plenum box collar using steel rivets, spot welds, lock forms, or sheet metal screws, 4"
(102) max. OC, equally spaced around the circumference of the collar. Make sure fasteners do not interfere with damper
operation
4.
Insulation shall be semi rigid Type R-6, 1 1/2" (28) or Type R-8, 2" (51) fiberglass duct liner, minimum density 1.5 pcf.
Insulation is self-supporting within plenum box. All internal surfaces must be lined with insulation, excluding outlet collar. The
bottom edge of the insulation is trapped by a lip that is formed on the plenum box that extends a min. of 1" (25) from the
inner edge of the opening to the outer edge of the box and extends a min. of 1/2" (13) up into the opening. See detail above.
5.
Refer to page 1 of 2 of document IOM-CRD0763INST for ceiling damper installation detail.
6.
The 0763 Series Ceiling Radiation Damper is classified for use in specific wood truss ceiling assemblies. See UL Fire
Resistance Directory for Floor/Ceiling design No.’s L550, L562, L574, L579, L585, M503 and Roof/Ceiling design No.’s P531,
P538, P545, P547, P552.
CRD12 DAMPER
FASTENERS
H+2 (51)
W + 2" (51)
PLENUM
4 1/2" (114) MAX
W
H
Type F Plenum
45° Inlet. Insulated Register Box
Round ceiling damper in inlet collar.
Min. size: 8" x 4" (203 x 102), 5" (127) dia. inlet
Max. size: 14" x 6" (356 x 152), 8" (203) dia. inlet
Max. Overall Height: 11" (279)
Type G Plenum
Top Inlet. Insulated Register Box
Round ceiling damper in inlet collar.
Min. size: 8" x 4" (203 x 102), 4" (102) dia. inlet
Max. size: 14" x 8" (356 x 203), 8" (203) dia. inlet
Max. Overall Height: 8" (200)
