Reznor V3 Series Model UDAP Gas-Fired Unit Heaters are available in 14 sizes ranging from 30,000 to 400,000 BTUH gas input. Sizes 30-125 are approved for residential application. All sizes are approved for commercial/industrial installations. Model UDAP heaters are designed for 82-83% thermal efficiency and are approved for installation in the United States and Canada by the Canadian Standards Association(CSA). Reznor V3 Series unit heaters have a refreshing new appearance with a glossy white cabinet finish, unique Reznor mitered corner and less visible hardware. Each size cabinet is easily suspended from either 2 or 4 suspension points, or an optional hanger kit for all sizes allows for ceiling mounting. The low voltage terminal strip on the outside of the cabinet makes connecting control wiring easy with no panels to remove. The addition of a G terminal to the strip, along with the new design of the circuit board, allows for fan only operation (without adding relays).