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
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.
Fits a 14" x 14" opening.
Fan adapters work with the Maxxair Fan Deluxe series and the Fan-tastic Vent fans.
The outside adapter
will fit anywhere along the cargo part of the roof. 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.
If you order the framing strips they will come in a separate box.
The option with butyl tape includes 64" of tape. If
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
We make adapters to fit air conditioners and adapters for offset locations. Please contact us so we can verify size and location.
Roof Vent Adapter Install procedure:
We recommend 3m Window-weld 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.
If you have questions about this product you can call Hein at 541-49O-5O98