Locate the ventilator's position and cut or drill a 4" diameter hole from the inside.

Cut the tube to length and inset into hole. Seal inside and out with caulk provided.

Screw the exterior grill assembly to the outside wall.

Remove the cover from the interior control module and fasten the rear part to the interior wall with the screws and anchors provided

Slip the damper slide control into the bottom channel.

Replace the cover, and your ASV-90 is ready to use!