DESIGN FEATURES Maximum Performance, Comfort, and Efficiency Modine model POR oil-fired unit heaters offer an efficient and reliable means of heating, 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. They are available in three model sizes: 100,000, 145,000, and 185,000 Btu/hr outputs.