Product Overview Manuals and Guides Product Overview Williams Furnace Vent Extension for Direct Vent Furnaces. It is for use with walls that are 15 - 24 inches thick. 24" Extension for a 14,000 BTU Direct Vent Furnaces, model 14038 and 30,000 BTU Direct Vent Furnaces, model 3003 Product Manuals Load More
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