Instructions / Assembly
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3. From inside the attic, nd the center point between the two roof rafters and mark it as the center of the
fan hole. Partially insert a screw into the center point mark.
NOTE: If you have a tile roof, you will need to move tiles out of the way before tracing and cutting.
4. Go to the roof. Using the screw as a reference point and the provided template, trace out the 22”
diameter circle.
5. Use a reciprocating saw to cut out the traced hole pattern from the roof decking. Remove the cut out
decking material from around the hole as needed. (See Figure 2.1B)
If installing on a tile roof, continue to step 6. If installing on a shingle roof, skip to step 12.
6. Apply weatherproof barrier to the roof. (See Figure 2.1C)
7. Position the fan so that it is centered with the vent hole.
8. Lifting the fan unit up at an angle, apply weatherproof sealant to the
bottom side of the fan unit. This will help keep the fan in place and
will seal nice and tight.
9. Using a minimum of 8 roong nails, nail the fan to the roof
through the primary ashing. To prevent leaking, be sure to apply
weatherproof sealant on the nail heads. Once complete, apply more
weatherproof barrier to the top of the ashing.
10. Using sheets of aluminum, construct a secondary ashing out of
two pieces of material by cutting out a semi-circle shape on either
side while aring up the edges that will stick up above the tile,
creating a “bib” that will go around the fan. Once constructed,
install the ashing material on top of the primary ashing and attach
using weatherproof sealant.
11. Apply weatherproof sealant all around the fan housing and
secondary ashing, closing the gap between the ashing, the fan
unit, and the tile. Using an angle grinder, cut the removed tiles as
needed. Re-install the tile around the fan unit.
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Figure 2.1A
Figure 2.1B
Figure 2.1E
Figure 2.1D
Figure 2.1F
Figure 2.1C