The rotary valve unit is designed to be installed on the cockpit side of the Glasair firewall. It is designed with two cabin heat outlet tubes (one for the pilot and one for the co-pilot) and a single outlet tube for windshield defrost. In the off position two openings forward of the firewall allow heated air traveling form the exhaust heat muff to be vented into the engine compartment, avoiding hot spots inside the heat muff. Very accurate, smooth control of cabin heat air is accomplished through the unique rotary action. As the center tube continues to rotate, the cabin heat slots will continue to open then begin to close as the defrost slot opens offering a desired metering between cabin heat and defrost.

For those who have modified their firewall from original design specifications, a 3 3/4" horizontal distance is required between the aft face of the firewall and the forward most point of movement on the rudder pedal assembly. The Cabin Heat Valve Assembly may be purchased separately or as a complete installation including all hardware, spun aluminum flange, and 11 feet of SCAT tubing. Weight 9.1 oz.

Cabin Heat Valve Assembly Part No: 471-0810-201

Cabin Heat Valve Installation Part No: 381-0142-503