A:Answer For high-output gas ranges or cooktops, the minimum rate of 1 CFM of ventilation per 100 BTU is recommended. For example, if your high-output burner output is 45,000 BTU, look for a range hood that provides 450 CFM to best clear the air. However, the higher the CFM, the louder the hood will be. The right burner has a BTU output of 18500 / 12500 (UltraHeat™). ^Daphane