Advertisement
Base Mount Method
The base mount method is the standard mounting method for CRD-2WT's. It may also be used on CRD-1WT's with
steel plenums that either have an insulation band or are duct mounted. An insulation band is used on units with steel
plenums that have a width or height greater than 12 inches [305 mm](see Figure 7A or 7B for reference).
1) The damper assembly is to be attached to the trusses using 2 -1 in. x 1 in. x 16 ga. or 2 -1
mm x 25 mm x 1.5 mm or 32 mm x 25 mm x 1 mm) mounting angles. See Figure 6 for alternate mounting angle
detail. Attach each mounting angles to the damper with a minimum of 2 - #8 screws or
steel rivets.
Note: Make sure the fasteners do not interfere with the damper operation.
2) Install the damper assembly with attached mounting angles between the trusses as shown in Figures 7 & 8.
Attach mounting angles to the trusses using 4 - 1
For Grille Mount Installations
The grille/diffuser frame shall be steel. The grille/diffuser shall be attached with a minimum of 4 - 1 in. (25 mm) long
#6 screws run through the gypsum wall board into the plaster flange (Figures 7A and 7B).
For Duct Mount Installations
For duct mount installations a minimum 1 in. x 1 in. x 24 ga. (25 mm x 25 mm x 0.7 mm) retaining angle 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 (Figures 8A and 8B).
4
CRD-1WT & CRD-2WT
Figure 5: Hanger Method: Duct Mount with Steel Plenum
⁄
in. (32 mm) long steel screws per mounting angle.
1
4
1 in.
3 in.
Figure 6 - Alternate Mounting Angle (provided by Others)
9
1: Damper
2: Plaster flange
3: Gypsum board
4: Duct
5: Duct retaining angle
6: RC channel
7: Steel plenum
8: Hanging strap, angle, or wire
9: Horizontal support stud or angle
⁄
5
32
1/2 in.
minimum
3 in.
⁄
in. x 1 in. x 20 ga. (25
1
4
in. (8 mm) diameter
Advertisement
