8.6in.L x 7.7in.W x 7.5in.H unit mounts to the wall of your van, bus or RV to save space. 12V auxiliary heater uses warmth from your engine to efficiently heat your cab as you drive. 2-speed reversible motor delivers 17,500 BTU and 150 C FM on high, 12,500 BTU and 100 CFM on low. Draws 1.9 to 3.9 Amps. 5/8in. outlet. Hardwiring required (mounting kit included). U.S.A.