Adjust length by cutting the duct to preferred length. Cut a rectangular hole for the grill in the soffit when the location of the grill is decided. Remove the protection seal of the grill. LINER CABINET POWER UNIT FIG 2 Attach the conversion duct to the wall or soffit. Attach the grill with the screws provided to the soffit. Please refer to cross section FIG4 for detailed assembly. Do the taping to each joint with duct tape. When installing without a soffit, please refer FIG5 CONVERSION