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; 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; wherein the natural convection vent construction includes a draft hood, the method further comprising mixing ambient air with the products of combustion as the products of combustion flow into the draft hood. view more