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Installation
Important note for CRD-1WT's: For grille mount installations the damper blades shall be a maximum of 3
mm) above the top of the ceiling plane. For duct mount installations the damper blades shall be a maximum of
(6 mm) above the top of the ceiling plane.
Hanger Method
The hanger method is the standard mounting method for CRD-1WT's. It may also be used in lieu of the base mount
method (see below) with the CRD-2WT. However, the hanging wire or straps would have to be field supplied.
1) Dampers shall be supported in a minimum of two places on opposite sides of the damper with a minimum
1
⁄
in. x 24 gauge steel strip, 18 swg vertical hanger wire or
1
2
angle, steel strip, or hanger wire shall in turn be supported by a minimum
nominal 2 in. x 4 in. wood support studs. The horizontal support angles or studs shall be fastened at each end
to adjacent trusses with minimum 16d nails, No. 8 screws or bolts. Only one connection per end is required (see
Figures 3 - 5).
For Grille Mount Installations
1) The grille/diffuser frame shall be steel. The grille/diffuser shall be attached with a minimum 4 - 1 in. long #6 screws
run through the gypsum wall board into the plaster flange (Figure 3 & 4).
For Duct Mount Installations
1) The duct retaining angles, 1 in. x 1 in. x 24 gauge, shall be installed on all four sides and shall be attached with a
minimum of 4 - 1 in. long #6 screws run through the gypsum wall board into the plaster flange (Figure 5).
Figure 3: Hanger Method: Grille Mount with Steel Plenum
Figure 4: Hanger Method: Grille Mount with Duct Board Plenum
⁄
in. x
⁄
in. x 26 gauge vertical angle. The vertical
3
3
4
4
⁄
in. x
⁄
in. x 26 gauge steel angle or
3
3
4
4
8
1: Damper
2: Plaster flange
3: Gypsum board
4: Grille
5: RC channel
6: Steel plenum
7: Hanging strap, angle, or wire
8: Horizontal support stud or angle
8
1: Damper
2: Plaster flange
3: Gypsum board
4: Grille
5: RC channel
6: Duct board plenum
7: Hanging strap, angle, or wire
8: Horizontal support stud or angle
⁄
in. (83
1
4
⁄
in.
1
8
CRD-1WT & CRD-2WT
3
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