Abstract: A heat exchanger coil has its fins coated with a photocatalytic semi-conductor material in such a manner that its fins may then be illuminated by UV light to activate the material so as to cause the oxidation of organic pollutants which are on the fin coils themselves or in the air passing therethrough. A preferred photocatalytic semi-conductor material is titanium dioxide, which may be applied to the fin stock prior to the fabrication of the coil.

Abstract: A variable inlet vane adjusting construction including a plurality of vanes pivotally mounted about a hub, an adjusting ring circumferentially slidable on the hub, a plurality of circumferentially spaced axial slots on the adjusting ring, a bearing of substantially solid rectangular configuration in each of the slots and in engagement with the sides of the slots, a plurality of pin members each having first and second ends with the first ends being mounted for universal movement on each of said bearings and the second ends fixedly mounted on levers which are in turn fixedly secured to the vanes.