Patent ID: 7634977

Claim:
A method of interfacing a natural convection vent construction with a water heater, the method comprising: providing a water heater having a burner, a blower, and a flue; creating products of combustion with the burner; forcing the products of combustion into the flue under positive pressure with the blower; interposing an exhaust plenum between the flue and the natural convection vent construction; positioning a deflector in the exhaust plenum; impinging the products of combustion upon the deflector to resist direct flow of the products of combustion through the plenum into the natural convection vent construction under the influence of the blower; dropping the pressure of the products of combustion to near atmospheric pressure within the plenum; and permitting the products of combustion to rise out of the plenum and into the natural convection vent construction substantially entirely under the influence of natural convection.