We are committed to resolving any issues promptly to your satisfaction. Gross weight: 2.2KG. Rated current: 1.1A. Tools Required: For installing the simplified ventilation fan, you will need a tape measure, a handheld drill, a marker pen, a drilling machine, and sealant. (Tools need to be provided by yourself). Roof Opening Size: The installation requires a roof opening of “355x355mm”. Position the fan’s flange at the roof opening (with the fan cover opening facing the rear of the RV) and trace the outline of the installation flange with a pencil. Preparing the Flange: Remove the installation flange from the neck opening and flip it over. Apply compatible sealant or filler to the bottom surface of the installation flange. Securing the Flange: Press the installation flange firmly onto the roof and secure it in place using screws. Additional Sealing: Apply additional structural adhesive around the screws and the edges of the installation flange to ensure a seamless fit. Electrical Connection: Connect the ventilation fan’s power cord to the 12V power source inside the RV using appropriate wiring. Interior Lifting Frame Adjustment: Measure the thickness of the RV’s roof. If the roof is thin or the interior trim is too long, trim the interior lifting frame to fit the roof opening height. Final Assembly: Install the interior lifting frame onto the ventilation fan from inside the RV, secure it with screws, and cover it with a cap. If replacing an existing ventilation fan, ensure all old sealant is removed and the roof opening is thoroughly cleaned and inspected for any damage or leaks before proceeding with the new installation. Use wiring with a minimum cross-sectional area of 1.5 square millimeters. Connect the red wire to the positive terminal and the black wire to the negative terminal of the power supply. Use countersunk self-tapping screws for all installations to ensure a flush finish. Please contract us firstly If there are any problems when you received the package.