Williams 9901 - Oval Vent Starter Kit for Top-Vent Furnaces Designed to be used on Williams brand top-vent furnaces. Contains starter hold down plate, oval-to-round adapter and two pieces of 24" oval pipe. Available Product Literature: (These files require the free Adobe Reader to view.) Download the Installation Guide Know to be Used on the Following Williams Equipment Models: 2509621, 2509622, 3509621, 3509622, 5009621, 5009622, 3509622.6
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