Roof Vent 14″ x 14″ (35.5cm x 35.5cm), with 12v electric fan, all BLACK. The skylight roof vent is the ideal accessory for the motorhome, camper van, or house box which requires additional ventilation. It’s also ideal for venting small spaces, the built-in 12V fan provides additional ventilation. Made from superior quality impact and UV resistant materials supplied with permanent air flow ventilation system and mosquito screen. Overall vent Size is 420mm x 420mm. The cut hole needs to be 355mm x 355mm. Instructions to fit this on. Place the internal cap (garnish) on top of the roof and draw a template using a felt tip, then add another 5mm to the top and left side. Drill pilot holes in each corner and cut along the template line. Be certain to avoid ribs, braces, and electrical wiring (internally). Check that the internal cap fits through the aperture If not, cut out the opening as needed and then smooth down any rough edges and primer the exposed with metal oxide paint. Make a wooden frame around the aperture to the thickness of the interned finish depth required, taking into account the roof ply and lining. Glue the frame with Shield Stick and Seal (polyurethane) clap in place and allow the adhesive to set. Screw the internal cap to the timber frame and seal around the lip from the top of the roof using flexible putty or Sikaflex. Place the external vent over the lip of the internal cap and mark the screw holes with a center punch. Then remove the vent from the roof and drill all screw hole locations with a 1/16” pilot hole, and seal with primer paint. NOTE: If installing a power or lighted vent, provide a power source of 12 volts DC, using an 18-gauge wire. Place putty strips/ Sikaflex flex bead around the opening on the roof ½” (1.27cm) from the edge of the opening. Be sure putty strips cover the entire area to be sealed. Use double layers of putty strip or extra Sikaflex if necessary, to seal ribbed areas. Insert vent into opening on top of putty strips. Use a screwdriver or nail to locate and line up corner drilled holes with the corner screw holes in the vent frame. CAUTION: Install vent with lid hinge side toward the front of the vehicle. Screw corner screws first to hold the vent in place then screw all remaining vent mounting screws. Tighten just enough to compress putty tape. Over-tightening may cause Plastic Base Vents to crack. Using the appropriate roof coating for your roof surface, coat screw heads, and vent frame edge and seal around the frame if necessary. Your installation is complete. If you are retrospectively fitting the roof vent you must take care when cutting the aperture so as not to damage the existing head lining and leave enough to cover the timber frame if required. All items are stored in and dispatched from the United Kingdom. Please be aware service to the aforementioned postcodes can take an additional 1-2 days including our express service.