4PHC - Biomass / Pellet Horizontal Vent Cap - 4"Biomass Products Catalog Metal Fab 4PHC Biomass Pellet Horizontal Vent Cap 4" Stainless steel cap prevents entrance of rain and directs flue gases away from house. Available in 3" and 4" diameters. 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 Stainless liner Galvanized casing 3" Clearance to combustibles Tested and Listed to UL 641. Pipe
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