4PWT - Biomass / Pellet Wall Thimble - 4"Biomass Products Catalog Metal Fab 4PWT Biomass Pellet Wall Thimble 4" Provides the proper clearance for the pellet corn pipe when it passes through a combustible wall. For use with biomass fuels such as pellet, corn, wheat or other grassy and woody plants as specified by appliance manufacturers. Features Type L Biomass Chimney 3" Clearance to combustibles Tested and Listed to UL 641. Pipe and fittings available in 3" and 4" diameters Factory built
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