The Metal-Fab 3PFS is a UL Listed galvanized firestop spacer for biomass chimney L vents. It is designed to support pellet systems during vertical and horizontal installations. This spacer is compatible with Metal-Fab's three-inch and four-inch pellet vent systems, all tested to UL standard 641.
Positive twist lock for assembly without tools.
Rope gasket at each joint prevents fly ash leakage.