Plenum-rated approved for installations in concealed spaces (between finished ceiling and drop ceiling, plenum space, or inside a plenum). It may be installed in areas that are not readily accessible and may be installed for freeze protection Multiple heat rise selection 20-gauge all powder coated steel construction Acoustic fiberglass insulation Single point power connection Heavy-duty steel finned heating element Quiet, efficient, forward-curved centrifugal blower Compact size, zero clearance, design for horizontal installation Connects to duct work for home extensions – eliminates running duct work to HVAC saving money and time High limit thermal cutout - automatic reset Built-in disconnect switch Fan-only option Timed blower on/off delay External 24Vthermostat control (not included) PSC-type 2-speed motor (ex. 480V models)