FSA Series Low Profile Unit HeatersProduct Features:: Residential - Low Profile Units. Great For Garages & Shops. Power Exhaust System Allows Vertical Venting To 25' orHorizontal Venting To 40' Sidewall Venting Eliminates Roof Penetrations. Wiring Junction Box Is Located Inside Of Unit. Self-Diagnostic Board with Led Display Improves Troubleshooting. 1' Clearance From Ceiling For Easy Installation. Heating Capacities From 30,000 - 75,000 BTUH. Up To 81% Thermal Efficiency. Easy To Clean Tubular Heat Exchangers, Made Of Aluminized Steel, Provide Resistance To Corrosion and Oxidation. Direct Drive Propeller Fans Are Dynamically Balanced For Quiet and Smooth Operation Self-Diagnostic Board with Led Display Improves Troubleshooting Efficiency and Accuracy.