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- Open all doors and windows to disperse the gas. If you still smell gas, call the Gas Company and Fire Department right away. CAUTION 1) For general ventilation use only. Do not use to exhaust hazardous or explosive materials and vapors. 2) To reduce the risk of fire, use only metal ductwork. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) to prevent back drafting. 3) Follow the heating equipment manufacturer’s guideline and safety standards suc