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WHAT COMES IN THE CARTON
To make sure you have everything you need
to install your new whole house attic fan,
unpack the carton and take inventory. The
carton should contain:
(1) Fan assembly
(1) Return grill with (6) fasteners
(1) 1-inch wide x 84-inch long roll of
adhesive-backed foam
(1) Remote controller (Batteries not
included)
(6) Hex head screws for mounting fan
unit to ceiling joists
Step-by-step
installation
A
Proposed fan
location
Center
of
hallway
ceiling
Step 1: Select a central
location for the fan
Your whole house attic fan is designed for
•
horizontal mounting on the floor of your attic,
usually above a centrally located hallway.
Note:
For vertical installations, the fan should
be mounted between 16-inch OC wall studs
only. For 24-inch OC wall studs, framing will
have to be installed to simulate a 16-inch OC
wall stud situation at the desired fan location.
Installation procedures are essentially the
same as those for a horizontal installation.
In the hallway, find the center of the ceiling
•
by measuring half the distance between the
walls. Mark the spot with a pencil.
Drill a hole with a small bit on the ceiling
•
mark, and push a straight length of wire
through the hole so you can locate it in
the attic.
(Illustration A)
Step 2: Investigate
the attic location
Go to the attic and find the hole you've made
•
in the ceiling from below.
Locate the joist nearest to the hole.
•
Clear the insulation between the joists at
•
the location of the hole (approximately 1
feet on each side of hole).
Wear work
gloves to avoid skin irritation from the
insulation.
Check for electrical and other wires or pipes.
•
If any wires or pipes are in the way, you can
have them moved by a professional or pick
another location to mount the fan.
Check the clearance above the fan location.
•
There must be at least 24 inches between
the top of the fan and the roof. Providing
enough air space above the fan helps
prevent the motors from overheating and
keeps them running efficiently.
In addition, make sure that enough clearance
•
exists for the path of the shutter. To ensure
proper operation, a minimum of 4 inches
clearance is required on the hinged side
of the unit. No framing lumber, truss mem-
bers, utilities, etc. should impede the path
of the shutter.
Warning:
Failure to provide sufficient shutter
clearance could result in damage to the
product.
/
B
14
1
/
(22
1
/
Holes at
11
1
"
4
/
(7
1
")
center of
4
cutout sides
Hole at
center of
hallway
/
11
1
"
4
/
(7
1
")
4
16"
(24")
Step 3: Establish cut-out
location inside attic
Note:
If the whole house fan fits through
your attic access opening, the remaining
installation steps can be performed from
inside the attic except the grill installation
(Step 8) and possibly the cutting of framing
lumber. (Step 5)
Select the joist bay that has the "centering"
•
hole which was created in Step 1, provided
that the criteria established in Step 2 are
satisfied.
Note:
If ceiling joists are parallel to the length
of the hallway, it is possible that the whole
house fan will not be centered in the hallway
ceiling. Another location may need to be con-
sidered depending on personal preferences.
Drill two holes at the edges of the joists in
•
perpendicular line with "centering" hole.
(Illustration B)
Note:
Make sure that the perpendicular
distance between joists is approximately
14 1/2 inches for 16-inch OC joists or
22 1/2 inches for 24-inch OC joists.
For 16-inch OC joists, measure 11 1/4 inches
•
/
1
2
(or for 24-inch OC joists, measure 7 1/4
inches) from both sides of both holes along
edges of joists and mark. This locates the
four corners of the cut-out as shown.
(Illustration B)
2
Step 4: Cut the hole
Using a keyhole saw or utility knife, cut
•
between the four corner locations.
Note:
you may first want to cut a hand-sized hole
at the center to allow for a place to secure
the sheet rock while cutting between the four
corners. This should help prevent the face of
the sheet rock from tearing below.
C
"
2
")
2
Step 5: Install the
Corner
framing members
marks for
cutout
Depending on the ceiling joist spacing, cut
•
2X lumber to (2) 14 1/2-inch lengths for
16-inch OC joists or (2) 22 1/2-inch lengths
for 24-inch OC joists.
Corner
Note:
marks for
sure before cutting lumber.
cutout
Using nails or wood screws (not provided),
•
install the framing members between the
joists with the inside edge flush with the
exposed sheet rock edges.
Optional Step:
•
of the fan in the "Exhaust Mode" (higher
speeds), install additional 2X framing lumber
above the ceiling joists and framing members
to create a box that extends the fan further
away from the plane of the ceiling and the
grill.
Warning:
clearance is available for the fan (Step 2).
In addition, the framed box should be sealed
so that attic air can not be drawn into it
through the joints.
Note:
the possibility of blown-in insulation from
being carried by the airflow and should also
help prevent the insulation from impeding the
path of the shutter. If after this step has been
implemented and the insulation is still moved
by the flow of air, an air dam can easily be
created around the three, non-hinged sides
of the unit using either cardboard or lumber.
This air dam will force the flow of air to travel
up and over the top of the insulation.
Step 6: Mount the fan assembly
Using the 1-inch rolled adhesive-backed
•
foam, cut and apply to the underside of the
flange around perimeter of housing wall. (For
positioning: Edge of foam can be butted
against wall of housing.) Application of the
If you are cutting from inside the attic,
/
22
1
"
2
/
(14
1
")
2
/
14
"
1
2
/
(22
1
")
2
Install framing
2 x's flush with
sheet rock
cutout edges
Verify these lengths with a tape mea-
(Illustration C)
To help reduce the noise level
It is critical to ensure that enough
This optional step should help minimize
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