Modine POR oil-fired unit heaters offer an efficient and reliable way of heating a space, particularly in regions where supplies of other fuels, such as natural gas, may be unavailable, undependable, or interruptible. The units are direct driven propeller fan-type units designed for overhead suspension and horizontal delivery of heated air. Time-tested and field-proven components are engineered into the design of these compact units, which produce comfort heating at the lowest cost through their highly efficient operation. Models are UL-listed and require fuel oil grade No. 1 or 2, as specified by ASTM (American Society for Testing and Materials) D396-73 Standard Specifications for Fuel Oils or Canadian Government Specification Board, 3-GP-28. Advanced burner and burner controls with the latest in burner and burner control technology. Durable, attractive casting design is treated for protection against corrosion. Quiet, efficient, and safe air move with propeller fan statically balanced and motor resiliently mounted to the figure-proof fan guard. Effective heat throw and coverage are controlled by manual adjustments of standard horizontal louver blades. Superior life expectancy due to corrosion-resistant, 14-gauge aluminized steel heat exchanger and the roll-formed design of the heat exchanger. All units are factory-assembled, wired, and fire tested before shipment, making them ready to be installed once they get to the job site. Reduced maintenance, easy-to-service with a convenient inspection port, and service door opening. Supplied with a 1/8” MPT connector and screw terminals. Oil Safety Valve – Protects the burner pump from excessive line pressure. The maximum inlet pressure is 60 PSIG. Designed, Engineered & Assembled in the USA