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Mr. Heater F102860 4" Horizontal Stainless Steel Full Ventilation Kit - Wall/Roof Mount for Big Max MHU50/MHU80 Unit Heaters, Includes Wall Thimble, Roof Flashing Set, 3"-4" Adapter, 4" 90° Elbow, 4"x36" B-Vent Pipe, 4"x24" Vent Pipe, F260410, 13 lbs, 4" · 9% commission · Growi Marketplace