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By running this fan through the night, homeowners can extract the maximum possible amount of heat from their
home’s structure and contents. This essentially “pre-cools” the home ahead of the rise in temperature the next
day, which reduces or can even eliminate the need for air conditioning. This VentCool Whole House Fan has been
designed specifi cally for quiet and effi cient operation. As such, we strongly recommend homeowners run this fan
through the night to reduce their energy expense.
With the above theory of operation in mind, adhere to the following guidelines when choosing a location for this
fan:
• Locate this fan in a central location, away from windows that will be opened during its operation. Installing this
fan centrally promotes an even replacement of air throughout the home, and the longer the path of air travels
from an open window to the fan, the greater the cooling effect.
• The damper provided with this fan can only be installed in a horizontal orientation, thereby requiring the unit
to be installed in the ceiling.
• Locate this fan at the highest point possible. This exploits natural convection and helps the fan exhaust the
hottest indoor air from the home.
• Typically, the ideal location for this fan in a two-story home is in the open area at the top of the stairs.
• Avoid locating this fan in a narrow space or over hard fl ooring as sound refl ecting off of hard surfaces can
amplify its percieved noise.
• Even though this fan is extremely quiet, we specifi cally recommend against installing it in a bedroom as
humans’ perception of noise is far greater when the surrounding environment is quiet (such as within a bed-
room at night).
• Within the attic, locating the fan near an electrical outlet or power supply can minimize the need for additional
electrical work.
INSTALLATION
The 1.7 unit has been designed to fi t into a 14½” x 22½” wall or ceiling opening. Since most modern houses have
been built with either 16” or 24” on-center (O.C.) spaced joists or studs, a simple “box” is constructed in the ceiling
or wall.
In Figure 1 at right, two 24”x16”s (to match
existing 24”x16” attic joists) have been
cut 14½” long and nailed in place 24” O.C.
apart to form the box shown. If your joists
or trusses use 2x4, 2x6, 2x10, etc., use the
appropriate depth pieces. For 24” O.C. joists,
place the cross pieces 16” o.c. apart, creating
a box with inside dimensions of 14½”x22½”.
Use a stud fi nder to locate the joists
or studs from the living space or drill
pilot holes from the attic space to outline
the grille opening in the drywall ceiling
or wall. Cut the opening with a drywall
cutter. The opening should be 14½” x 22½”.
Place the included foam tape gasket over
the top of the joists, position the fan on
top of the joists, and attach the unit with
the wood screws (included). Do not over
tighten the screws, since this may reduce
the vibration isolation qualities of the foam
gasket.
Figure 1: Box Opening for VentCool 1.7
P/N 78010008000 05/19 Rev B
