Do not permit overhanging structures or shrubs to obstruct condenser air discharge outlet, combustion air inlet, or vent outlet. Minimum Clearances to Combustibles Front of Unit 24” Back of Unit 2” Left Side 12” Right Side 15” (from Vent Cover) Below Unit * 0” * Minimum clearance to combustible material below the flue is 10" to allow proper dissipation of flue gasses and temperatures. Table 1 In the U.S., units may be installed on combustible floors made from wood or class A, B, or C roof coveri