Instructions / Assembly
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4. 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.
If installing on a tile roof, continue to step 5. If installing on a shingle roof, skip to step 11.
5. Apply weatherproof barrier to the roof. (See Figure 2.3B)
6. Position the fan so that it is centered with the vent hole.
7. 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. (See Figure 2.3C)
8. 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. (See Figure 2.3D)
9. 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. (See Figure 2.3E)
10. 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. (See Figure 2.3F, 2.3G, and 2.3H)
Shingle Roofs:
11. If you have a shingle roof, insert the reciprocating saw sideways between
the shingles and roof decking. Starting at the 3 o’clock position of the
vent hole, begin cutting in a sweeping motion under the shingles, cutting
through any roong nails or staples. Continue cutting counter-clockwise
around the vent hole until reaching the 9 o’clock position. Using a
roong knife, cut a 4 inch horizontal slit in the shingles at the 9 o’clock
and 3 o’clock positions of the hole, allowing the fan’s ashing to slide
underneath the shingles.
12. Slide the fan unit underneath the shingles until the fan reaches the top of
the hole. (See Figure 2.3I)
13. 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 create
a tight seal. (See Figure 2.3J)
14. Secure the fan ashing to the roof using a minimum of 8 roong nails.
Finish applying weatherproof sealant around the fan and nails and secure
the shingles by re-nailing them into the roof. (See Figure 2.3H)
Figure 2.3I
Figure 2.3H
Figure 2.3J