Electrical filtered air heater

Claim 1

A heater adapted to provide dry, clean and heated air to a point of use comprising: a. a housing having end walls and transverse, spaced-apart partitions between said end walls, b. an electric heating unit located centrally and longitudinally of said housing and at least one end of said heating unit being mounted on one of said spaced-apart partitions, c. a metallic coiled tubing spaced from and surrounding said heating unit, said coiled tubing having ends which extend through the other of said spaced-apart partitions to maintain said coiled tubing in spaced relationship with said heating unit, one end of said coiled tubing extending through the end wall of the housing, d. supply means for admitting compressed air to said one end of said coiled tubing, e. a filter casing positioned within said housing having replaceable filter elements, said filter casing being connected at one end to the other end of said coiled tubing, the other end of said filter casing being connected to exhaust means extending through said end wall to thereby support said filter casing between said other spaced-apart partition and said end wall, said exhaust means carrying the dry, cleaned and heated compressed air to the point of use, and f. electrical control means mounted between said other end wall and said one of said spaced-apart partitions for controlling the degree of energization of said heating unit in response to the temperature inside said housing, said control including temperature responsive sensing means extending into the space between said partitions.