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INSTALLING YOUR WHOLE HOUSE FAN
BEFORE BEGINNING INSTALLATION, PLEASE READ INSTRUCTIONS
THOROUGHLY.
PRELIMINARY STEPS
1. Review the Attic Air Exhaust Requirements in the chart below.
Whole House Fans are designed to pull in fresh, cool air from the outside through
open windows in your home. Hot air that is in the home is pulled up through the
fan and into the attic, and then exhausted through vents in the roof, undereaves,
soffits or gables. This exhaust ventilation is measured in Net Free Area (NFA).
For your Whole House Fan to operate properly, you must have adequate
NFA as listed in the chart below.
2. Assemble the following tools and materials. They will be used
during the installation procedure.
3. Read through the 9 Installation Steps on the following pages before
beginning installation.
TOOLS NEEDED:
• Tape measure
• Marker or pencil
• Circular saw, saber saw, or keyhole saw
• Hand saw
• Electric drill
• Screwdrivers (slotted & Phillips)
• Hammer
• Utility knife
• 6 to 8 ft. stepladder
• Goggles, rubber gloves, respirator mask
MATERIALS NEEDED:
• 11/2 pounds of #12d (3") common nails or #16 box nails (about 100 nails)
• Sixteen to twenty 1
1/2" ring shank drywall nails
• Twelve to sixteen 1
1/2" #8 decking screws
• Lumber of the same dimension and type (i.e., 2" x 6", 2" x 8" etc.) as your ceiling joists
to frame the shutter opening. The length of the lumber will depend on the size of your fan.
• Two 8-ft pieces of lumber of the same type as your ceiling joists (i.e., 2" x 6", 2" x 8" etc.).
Two 8-ft sections will be enough to face even the largest fan.
• Wiring Supplies:
UL-listed junction boxes that meet local code requirements.
3-conductor Romex cable with ground.
FAN
SIZE
24" up to 1800 sq ft (1 story) 8 to 10 sq ft (1152 to 1440 sq in)
30" 2000 to 3000 sq ft (1 story) 10 to 12 sq ft (1440 to 1728 sq in)
36" over 3200 sq ft (1 story) 12 to 14 sq ft (1728 to 2016 sq in)
SQUARE FOOTAGE OF
AREA TO BE VENTILATED
NFA (Net Free Area)
EXHAUST REQUIRED