30,000 BTU Direct-Vent Natural Gas Wall FurnaceCozy's Direct Vent Wall Furnace mounts on an outside wall and occupies minimal room space. The continuous seam welded combustion chamber draws air from the outside and exhausts through a concentric vent system, which keeps the interior air warm and fresh. The louvered cabinet design maximizes airflow, providing uniform temperatures from floor to ceiling. A telescoping vent assembly is included and fits a standard 5 in. 9 in. wall thickness,