The heaters are be constructed of a heavy gauge steel housing. The rough-in dimensions are 19-3/16 in wide x 4 in deep. The finish shall be baked-on powder coat in Ceiling White color. The units shall be available in ratings from 1500 through 4800 W with an optional factory installed single pole thermostat. The heaters have a low speed 600 rpm motor, which drives a vane axial blower to deliver a quite 175 cfm of down flow air. The heating element shall be of the block finned type with large, parallel steel fins for quick heat transfer. Unit shall have as standard, a manual reset capillary type limit control, for added safety.