Marley Engineered Products A24DD User Manual
READ AND SAVE THESE INSTRUCTIONS.
MODEL A24DD
LEAVE THIS MANUAL WITH HOMEOWNER
DIRECT DRIVE
WHOLE HOUSE VENTILATORS
IMPORTANT SAFETY INSTRUCTIONS
INTRODUCTION
Y our Whole House V entilator is designed and engineered to provide years of satisfactory service in cooling and ventilating your entire
house. Hot, humid air is drawn from the living areas and replaced by cooler outside air. This cooler air may be routed through selected areas
of the house by opening the proper windows and doors.
This Whole House Ventilator is a direct drive unit designed to provide maximum ventilation at minimum sound levels, and is supplied
with a 3-speed control. It is specifically designed and engineered to eliminate cutting of 16” O.C. joists, thus providing the easiest installation
available. The shutter is also designed to give an attractive flush appearance without cutting the center joist.
Shutter model required: Ceiling Installation — Model A3024
Wall Installation — Model 3130
WARNING:
TO REDUCE THE RISK OF FIRE, ELECTRICALSHOCK
OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
1. Do not use this fan with any Solid-State Speed Control Device.
2. Use this unit only in the manner intended by the manufacturer. If you have questions, contact the manufacturer.
3. Before servicing or cleaning unit, switch power off at service panel and lock service panel to prevent power from being
switched on accidentally.
4. Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable codes and stan-
dards, including fire-rated construction.
5. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuel burning equipment to
prevent back drafting. Follow the heating equipment manufacturer’s guideline and safety standards such as those published by
the National Fire Protection Association (NFPA), and the American Society for Heating Refrigeration and Air Conditioning
Engineers (ASHRAE), and the local code authorities.
6. CAUTION: For general ventilation use only! Do not use to exhaust hazardous or explosive materials and vapors.
7. When cutting or drilling into wall or ceiling, Do Not damage electrical wiring or other hidden utilities.
8. CAUTION: This unit has an unguarded impeller. Do not use in locations readily accessible to people or animals.
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CEILING INSTALLA TION
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 tentative location of fan and proceed as shown below.
STEP2 —Determine joist direction and locate center joist in tentative 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 vertical 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 covering 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” gasket 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 grommets 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.
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