FIGURE 2
FIGURE 3
FIGURE 4
FIGURE 5
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) 1
1
⁄
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.
