4.SECURING THE DAMPER/SLEEVE ASSEMBLY TO WALL OPENINGS.
Damper/sleeve assemblies must be installed in wall openings using flanges and sheet metal screws as illustrated and described below.
•Flange on front (grille end) of sleeve must be a minimum of 16 gauge (1.5mm) steel and have a 5⁄8 in. (16mm) minimum flange leg (refer to Figure 2). Using #10 (19mm) sheet metal screws, screw from inside of sleeve through the rear portion of the studs (as shown in Figure 1). Space screws a maximum of 6 in. (152mm) on center and a maximum of 2 in. (51mm) from the corners (minimum of 2 screws per side).
No retaining angles are required on the side of wall opposite from the grille.
•Retaining angles on continuing duct must be a minimum of 11⁄2 in. x 11⁄2 in. (38mm x 38mm) 16 gauge (1.5mm) steel (refer to Figure 3). Screwing sleeve to steel studs is not required.
•Retaining angles must be attached to the sleeve using one or more of the following methods of attachment:
•Tack or spot welds
•#10 (19mm) sheet metal screws
•1⁄4 in. (6mm) bolts and nuts
•3⁄16 in. (4.7mm) steel pop rivets
Attachments must be spaced a minimum of 6 in. (152mm) on center and a maximum of 2 in. (51mm) from corners. The angles must be attached to all 4 sides of the sleeve. A minimum of two attachments are required on each side, top and bottom. The angles need not be attached to each other at the corners.
caution! Do not tear the thermal blanket during installation.
Dampers are tested for correct operation and are square and straight before shipment from the factory. Dampers must be installed square and straight and must not be twisted or racked. Failure to install the damper square and straight may prevent the damper blades from operating open and closed.
5. ACTUATOR CONNECTIONS
Electrical and/or pneumatic connections to damper actuators should be made in accordance with wiring and piping diagrams developed in
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compliance with applicable codes, ordinances and regulations (see Electrical Guidelines).
6 Recommended Preparation of Openings in Wood and Metal Stud Walls
•Frame wall openings as shown (see Figure 4)
•Double vertical studs are not required for openings 36 in. x 36 in. (914mm x 914mm) or smaller.
•Gypsum wall board must be fastened 12 in. (305mm) on center to all stud and runner flanges surrounding opening(see Figure 4).
•All construction and fasteners must meet the requirements of the appropriate wall design (See UL Fire Resistance Directory) and/or local codes.
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