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CEILING INSTALLATION
LOCATING & MOUNTING FAN
STEP 1 — The A24DD fan mounts on ceiling joists that are
spaced 16” O.C. Fan should be located in center of house,
preferably in hallway or corridor. This will allow air to be drawn
through all parts of living space. (See Fig. 1.) Determine tenta-
tive location of fan and proceed as shown below.
STEP 2 —Determine joist direction and locate center joist in ten-
tative fan opening. Lightly pencil a rectangular 30 1/2” x 33 1/2”
opening on ceiling below where shutter is to be located. Make
sure 33 1/2” side is parallel to joist direction. Check to be sure
that enough clearance area is available on ceiling for overlap of
shutter flanges (1 1/2” on all sides). Drill two small pilot holes
close to center joist, (one on either side) to indicate where hole
will be centered. (See Fig. 2.)
STEP 3 — Now clear insulation and find pilot holes in attic.
Tentatively lay out same rectangular hole as on ceiling below.
Adjust location of hole if necessary to insure a minimum verti-
cal clearance from roof rafters of 18” above fan (Fig. 3).
FIG. 1
FIG. 2
FIG. 3
FIG. 4
ROOF RAFTERS
18” MIN
CLEARANCE
EXISTING
2 X 6 JOISTS
(DO NOT CUT!)
— 3 —
OVERLAP AREA
PILOT HOLES
FIG. 5
STEP 4 — Carefully cut hole in ceiling (Fig. 4), being careful not
to cut into center joist. Cut along both sides of the center joist,
leaving the 1 1/2” (approximately) strip of ceiling sheet rock cov-
ering the center joist.
If you have 2 x 4 joist construction, the joists on which
the fan will be mounted must be built up to 2 x 6 joist height. This
can be done very easily at this point by nailing (3) 2 x 2 furring
strips 38” long to the top of the joists, one on each joist.
STEP 5 — Remove adhesive backing from the 1/2” x 1/2” gas-
ket material and attach to the bottom flanges of fan which rest on
the joists. (Fig. 5) Now place fan on joists. Install grommet in
bracket (Fig. 5) and attach on each end of fan, using two of the
short screws provided. Position fan over opening so that grom-
mets are resting against center joist. Attach fan and brackets to
center joist with the two long wood screws and flat washers. Do
not crush grommet when tightening screws.