NEW ATWOOD RV TRAILER HYDROFLAME FURNACE HEATER 8535 IV 35,000 BTU 37635 Excalibur Model 8535-IV Electronic ignition 34,000 BTU LP Gas Furnace Size: 16-1/2"W x 7-3/8"H X 18"L Cutout Size: 17" W X 7-1/2 H