PelletVent is a complete venting system from DuraVent for stoves and inserts that use oil fuel or multi-fuels (including wood pellets corn cherry pits switch grass coffee husks walnut shells soybeans wheat sunflower hulls rapeseed and sugar beets). The 4 inch storm collar helps prevent water leakage in the home by deflecting rain and moisture from the vent pipe. Designed for use with a 4 inch round vent pipe the storm collar seals securely with silicone (sold separately) to ensure reliable lasting performance. For added durability PelletVent seams are factory-sealed on all elbows tees and fittings.