Available now, Insulated Vent Fan Cover https://www.ebay.com/itm/132946231471
Patent Pending adapter matches the contour of the OEM roof so a standard RV
style vent mounts to a flat surface. Prevents distorting the roof sheet
metal or vent flange and can be used as an aid for locating the fan.
They are CNC machined out of UV and fire
resistant expanded PVC. The fan mounts to the outside adapter. Fan adapters work with the Maxxair Deluxe series and the Fan-tastic Vent fans.
Fits a 14" x 14" opening. Longer screws than came with the vent
fan may be needed.
vent adapter outside dimension is 16 3/4 X 16 3/4. If you are using a Maxxair vent our adapter fits the deluxe series, other Maxxair vents have a wider flange. You will need a wider adapter. Please call.
framing strips are expanded PVC and bonded to the roof with a thick
bead of Windoweld. They are more flexible than wood and plenty strong to
support the vent and keep it from jiggling. We double them up when
installing roof top air conditioners. They are essential if the span
between the OEM roof beams is more than 18". They also provide a backing
for the screws that hold up the vent interior bezel. They should be
placed 1/4" away from the edge of the hole so the screws for the vent go
into the strips.
the butyl tape is stuck to the plastic, put it in the freezer for 30
minutes. It will release, then let the butyl tape return to room
Roof Vent Adapter Install procedure: We
recommend 3m Windoweld adhesive which you can get at Napa. Locate and
cut the 14 x 14 hole. You can use the adapter as a guide to mark the
hole. Stay clear of roof supports, obviously. Make a tape line 1/4"
beyond the adapter perimeter. De-gloss the area with a Scotch- brite
pad. No need to scuff. Just dull the paint. Clean with isopropyl alcohol
and let dry thoroughly. Blow dryer if it's wet and/or cold out. Apply
three 1/8" beads of the Window-weld on the face of the adapter. Then
press the adapter down onto the roof until the adhesive oozes out the
sides. It's not necessary to clamp. If you do, use a lot of lightly set
clamps and spread out the clamp force over the whole surface area. Using
the adhesive that oozes out, make a fillet around the adapter with a
double gloved finger. Pull the tape within 15 minutes. Cure is fast on
outside. Let cure overnight and then proceed with the fan install. We
recommend using butyl tape for the fan install. Cover the fan flange
with 1 1/8" wide tape. Place onto of adapter and press down. Then drill
pilot holes through the adapter and into the van roof. If the screws are
going to go into a roof support beam then drill a clearance hole in the
beam. You only want the screw to engage the adapter and outer skin. Use
a step drill to keep from plunging through the skin. You may need
longer screws. Tighten them very lightly against the fan flange. Some
butyl will ooze out which you can trim off. Coat the fan flange adapter
and onto the roof about 1/2" with brush on bed-liner or Flexseal from
the TV guy works well. Some sealants will melt the fan plastic so you
might try it on a portion of the interior bezel first. You'll cut a lot
of that piece off. Good idea to check the integrity and reapply the
sealant every so often. Dicor self leveling sealant also works but looks
a little messy.
The option with butyl tape includes 64" of butyl tape.
If you have questions about this product you can call Hein at