U.S. Sunlight 9930TR Solar Powered Attic Fan - Manual (Page 2)

Mounting the Fan
Step 2 – Sizing Requirements
See sizing chart on the product box or visit our website at www.ussunlight.com to assure that you select the correct number of
fans for your situation. Some attics have walled off or chambered areas that will require additional fans to properly vent the space.
If you have any questions or concerns please call our customer service specialists at: 1-877-50-USSUN
south or southwest
mid-day summer sun
Step 3 – Positioning of the Solar Fan
The solar fan should be positioned to face south or southwest for optimum performance and should be
positioned on an area of the roof that is not shaded or otherwise blocked from the sun for extended periods
throughout the day. The solar fan should be installed 18 – 24 inches from the top of the roof peak and as
close to the mid-point of your house as possible. In the case that 2 or more fans are getting installed you
should separate the fans by at least 15 feet to optimize ventilation. (fig. 4)
Step 4 – Marking the Hole
From inside the attic, measure down from the roof peak approximately 18 to 24 inches and center this
spot between two rafters. Drill a screw through this mark into the plywood and roof shingle so it will be
easily located from on top of the roof.
Some models include in the box a template for cutting out the hole. It is printed on the cardboard protect-
ing the base of the fan. Punch out the template. From on top of the roof, locate the screw and place the
cardboard template over the top of the screw aligning it in the center hole of the template. Using a pen
or marker, trace a circle around the outer edge of the template, resulting in a circle with a 14” diameter.
(fig. 5) If your product box does not include the template, simply use a 7” string, one end attached to the
previously drilled screw and the other tied to a pen or marker to create a 14” diameter circle.
fig. 4
fig. 5 Step 5 – Cutting the Hole
Using a power drill equipped with a ½ - 1” drill bit, drill a pilot hole anywhere along the
inside of the circle. Insert the saw blade into the pilot hole and follow the circle pattern to cut the hole
into the roof. (fig. 6)
fig. 6
Do not cut through any roofing rafters or framing members! Only cut and remove the roof sheeting and
shingles. Prior to cutting the hole, make sure you do not have any wires or waterlines in the area that
you are cutting. Before completely cutting out the circle, secure the removed material so it does not fall
into the attic space.
5”
Shingle
Felt Paper
Step 6 – Lifting the Shingles
The nails located 5” above and to the side of the hole will need to be removed for the solar fan flashing
to slip between the felt paper and the shingles – (fig. 7) You should use a pry bar or reciprocating saw
to loosen or cut any nails and/or staples.
Do not attempt to force the unit into place. If it does not slide easily into place, a nail is most likely
obstructing the flashing. In some cases the builder may have used large washers to install the felt
paper. In this case lift up on the flashing as you are sliding it under the shingles.
fig. 7
24”
roof peak
Step 7 – Installing the Solar Fan
Position the Solar Fan so that it is directly below the hole (fig. 8a) using the “Up” label
as a guide for orientation. Begin sliding the flashing of the Solar Fan underneath the
shingles and on top of the felt paper at the mid-point of the hole (fig. 8b). Continue sliding
the solar fan upward (making sure that the top of flashing is facing toward the top of the
roof) until it is positioned directly over the attic hole (fig. 8c). To comply with Florida Build-
ing Codes and TDI, remove shingles from all around the flashing and secure all 8 holes.
fig. 8a fig. 8b
fig. 8c
Step 8 – Securing the Solar Fan
Using the provided steel screws, secure the solar fan to the roof. The solar fan should be secured across the
bottom and on the sides of the flashing by driving screws through the visible pre-drilled holes at the bottom edge
of the flashing. To comply with Florida building codes and TDI, secure in all eight holes. Apply waterproof roofing
sealant to the screw heads (fig. 9). Use roofing nails as needed to secure any shingles that remain loose. Apply
waterproof roofing sealant to the backside of any loose shingles or nail heads that have been added.
fig. 9
If your fan comes with the solar panel detached, refer to Step 9a or 9b
for solar panel installation.