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WARNING!! Please verify the opening requirement on your Maxxair Fan. If it is 400mm x 400mm you need to purchase an adapter from our Euro Adapter listing https://www.ebay.com/itm/133005636767 Fits a 14" x 14" opening, for the Maxxair Deluxe Series Fan and Fantastic Fan. "Most Forward" or "MF" is further forward than the raised circle NCV3 is 2007 - 2018, VS30 is 2019 to present "Front Adapter" fits both Wheel Bases, center on the raised cirlce "Rear Adapter" is for a 144 WB "170 rear" is for the rear of a 170 WB "170 extended" is for the most rear of a 170 extended WB "All Rib" is for anywhere along the center with no gap in the ribs 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 vent fans. The adapter fits both high and low roofs. If your Maxxair is a 4000K or 4500K please let us know, these fans require a wider adapter. The 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. 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 length will need to be cut to fit the panel you are installing the fan in. Dimensions for the support strips are .75" x 1.5" x 38". If you order the framing strips they will come in a separate box. The option with butyl tape includes 64" of butyl 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 temperature. 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