4PRS - Biomass / Pellet Roof Support - 4"Biomass Products Catalog Metal Fab 4PRS Biomass Pellet Roof Support 4" For use on open beamed pitched roofs or ceilings. Includes trim pieces for finishing out installation. Also includes support band. 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
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