The Drescher Combustion Air Vent economically improves the efficiency of your conventional fireplace. It’s an age-old problem that homeowners need an air supply to use their fireplaces. They may pay dearly for it by drawing from their own household heat for fireplace operation which is costly and unnecessary. This can be effectively remedied by the durable cast iron Drescher Combustion Air Vent. It efficiently draws cold air from outside the home and generates the proper environment for combustion using unheated, FREE air. Like a damper, it controls air flow and continuously feeds combustion air into the fireplace.