This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. When passive cooling isn't enough Does your gear generate a lot of heat inside your wall-mounted Salamander Designs Chameleon cabinet ? This active cooling vent can help. It replaces the standard bottom vent in your cabinet, and it includes four thermostat-controlled fans. A heat sensor you attach to your hottest-running component controls the fans. The sensor activates the variable-speed fans at about 80 degrees , and they achieve maximum spin when the temperature reaches 95 degrees . Even at peak speed, the fans remain whisper-quiet while pushing 33 cubic feet of cooling air up into your cabinet. Note: Requires 2-1/2" under-cabinet clearance. Recommended for wall-mounted units; use with floor-standing cabinets requires custom feet to provide ample clearance. What's in the Box: 1. Active cooling bottom vent 2. Installation Instructions