Instructions / Assembly

INSTALLATION INSTRUCTIONS
THIS ROOF-MOUNTED UNIT IS DESIGNED FOR ATTICS OF AVERAGE SIZE AND OPERATES MOST
EFFICIENTLY WHEN AIR INTAKES ARE LOCATED AROUND THE EAVES. FOR LARGER ATTICS, USE
TWO OR MORE UNITS. AT LEAST 600 SQ. IN. OF NET FREE AIR INTAKE IS REQUIRED PER UNIT.
THE MOTOR OPERATES ON 115-V.A.C. 60HZ CURRENT. SEE MOTOR LABEL FOR AMPERAGE.
STEP 1: Place unit on top of shingles, bearing in mind that, for neat installation, the "low prole"
housing on the unit should be visible on only one side of the roof. This will require that the unit be
moved slightly down from the ridgeline.
STEP 2: When this position is established, locate a centerline directly between two rafters and, from
inside the roof, drill a hole through the roof. This hole will be used as a center for the following opera-
tions.
STEP 3: Draw a reference square 25 3/8" x 25 3/8" on the roof using the hole drilled in Step 2 as the
center. Within the square, draw a 17" diameter circle and remove shingles, nails, and felt from the circle
just drawn. Next draw another circle that is 14 1/2" in diameter on the decking. Be sure to use the hole
drilled in Step 2 as the center of this circle. (For your convenience, you may also use the template printed on
the product packaging.) Cut through the decking, using the 14 1/2" circle as the cut line.
STEP 4: Slide the ange of the unit up under the shingles (some roong nails may need to be
removed). Position the unit on the reference square (drawn in Step 1) to align the exhaust openings.
When the unit is properly located, apply a generous amount of roong compound between the ange
and the shingles (do not hot mop) approximately 1" inside the perimeter of the ange and begin to
secure with nails. Use galvanized roong nails and follow the nailing pattern in the diagram provided.
WARNING! When installing control box, screw unit in place to prevent damage to the thermostat.
Wire the unit according to the diagram provided. Be certain to conform to all electrical codes and
regulations. The thermostat is an adjustable on/o control. When the dial is set, the fan will shut o at
the setting chosen. The fan will start at 15°F above the setting chosen. EXAMPLE: If the setting is 90°F,
the fan will turn on when the attic temperature reaches 105°F and will turn o at 90°F.
STEP 5: Check the installation for leakage with water from a garden hose. Do not spray water directly
into the vent opening.