Sealed Combustion System Appliance (Direct Vent Appliance)
Sealed Combustion System Appliance (Direct Vent Appliance) : A system consisting of an appliance, combustion air, flue gas connections between the appliance and the outside atmosphere, and a vent cap supplied by the manufacturer and constructed so that all air for combustion is obtained from the outside atmosphere and all flue gases are discharged to the outside atmosphere