INSTALLATION (continued)
5.After layout is complete, drill a small hole down through ceiling at each corner of cutout. From below, connect these four holes with straight lines to mark cutout on ceiling. Using sabre saw or keyhole saw, cut and remove sheetrock.
6.Refer to Figures 2 and 3. Before cutting joists, lay a 2" x 4" across joists to be cut and adjacent joists, approximately 8" from end of opening. Nail 2 x 4's securely to joists. Cut and remove joist(s) 11⁄2" back from opening.
NOTE: Use caution not to cut sheetrock when you cut joists.
7.Refer to Figure 4. Using lumber the same height as joists, insert two brace back pieces that tie into cut- through joists and fasten to intact joists at either end of opening. Install headers of same size lumber between the two braces as necessary to complete framing of opening.
8.Refer to Figure 5. Nail 2" x 6" lumber laid flat, around the framed opening to form a platform for the fan. If ceiling joists are 2" x 6" or larger, 1" x 6" lumber can be used.
9.Refer to Figure 6. Install louver at this time. Louver must be installed with 1⁄2" clearance on all sides. To accomplish this, place small marks 3⁄4" from edge of cutout in ceiling.
Use these marks to locate shutter and secure with hardware provided with the louver. Install louver opening assist springs. Springs should extend approximately 6" at a 30° angle above louver connecting bar (See illustration). Install nails in frame to hold springs. Allow nail head to protrude 1⁄2". Install springs between nails and holes in connecting rods.
10.Center fan over opening in attic floor. Align fan so that air through louvers flows toward motor. This will extend the life of the motor.
NOTE: For added quietness, you may attach 1⁄2" thick rubber stripping to bottom of fan frame.
11.Refer to Figure 7. Capture the fan frame on all four sides by nailing wooden blocks to platform. Rubber padding can be used between block and frame to eliminate any possible vibration.
12.Unbolt the motor carriage from the fan struts. Flip the motor up and rebolt to fan struts. Attach fan belt and slide the motor carriage as necessary to achieve proper belt tension.
CAUTION: Too much belt tension can cause motor to overheat.
FIGURE 2 |
FIGURE 3 |
FIGURE 4 |
FIGURE 5 |
