Termination unit for a coaxial flue pipe

A termination unit for a through-the-wall horizontal vent of a gas combustion device having a combustion chamber and a burner, said termination unit comprising wall mounting means securable to a vertical wall outer surface and about an outer sleeve of a coaxial flue pipe, a fresh air chamber secured to said wall mounting means, an exhaust end of an exhaust flue pipe extending through said wall mounting means and said fresh air chamber to exit through an outer wall of said chamber, air intake ports in an outer peripheral wall of said chamber to supply fresh air to a coaxial passage between said exhaust flue pipe and said outer sleeve to feed said combustion chamber, air baffle means in said chamber about said exhaust end of said flue pipe extending through said chamber, and wind deflector means disposed in spaced relationship about said air intake ports of said chamber, said air baffle means being constituted by division walls disposed on transverse central axes of said chamber and disposed on opposed sides of said exhaust flue pipe, each of said division walls extending from an outer surface of said exhaust flue pipe to an inner surface of an associated one of said opposed parallel flat side wall and terminating at mid-length thereof, said division walls forming air current damping chambers inside said fresh air chamber wherein to equalize air pressure in said damping chambers to that in said combustion chamber.