Rotary drum plenum seal

Apparatus comprising an elongated hollow member rotatable about its longitudinal axis, a stationary enclosure having an opening therein, one end of said member being located adjacent said opening with the interior of the member being in communication with the interior of the enclosure, the member further being angularly adjustable about an axis adjacent said one end thereof, means for providing a flow of air through said member and enclosure, a hood mounted on said enclosure around the opening therein, said one end of the rotatable member projecting freely into said hood, and seal means disposed within the hood between the hood and said end of the rotatable member for preventing passage of substantial amounts of air therebetween while permitting rotation and angular movement of the member, said hood surrounding the adjacent end portion of said rotatable member, and said seal means comprising a flexible inner annulus encircling and frictionally engaging said rotatable member, and a flexible outer annulus in slidable engagement with the surrounding inner surface of the hood.