CDFSE "surface enclosures" are designed to mount flat on the ceiling and extend only 6 in. into the room. CDFRE “recessed enclosures” have no protrusions outside recess box, allowing the heater to recess only 7 in. into ceiling space. Mounts in T-Bar or permanent ceiling with trim ring. Three adjustable airflow patterns from 14 ft. ceilings: wide, narrow or asymmetrical patterns.