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40,000 BTU Heater with all new 45 degree face 8% faster due to the new 45 degree face without increasing AMP Draw or motor sizeTakes up 5% less space allowing more versatility during installation3% Lighter than previous modelsAmperage: Low 4.4, Med 5.8, High 8.5Maximum Estimated: BTU/h: 40,000Air flow: Low 230 cfm, Med 228 cfm, High 263 cfm.Hose barb: 5/8" kit includes: the heater, vents, vent hose, misc hardware (screws), 14" zip ties, and switch Dimensions: 16 W x 6.5 H x 9.5 D Cut out size: 6 x 16"