Vent cap assembly for exteriorly located fuel burning unit

摘要

A vent cap assembly through which combustion air is delivered to the fuel burning unit, and from which flue gas exits to the atmosphere is provided with a lower space through which the combustion air is admitted through an outer annular opening in the top of the housing for the fuel burning unit, and an upper space into which flue gas is discharged from the fuel burning unit, and in which a relief passage is provided to connect the lower space and the upper space to create pressure and flow conditions between the spaces to reduce the problems encountered with varying wind velocities and directions. The upper portion of the lower space is also compartmented to stabilize flow conditions.