4" PelletVent Pro Vertical Kit For Flat Ceilings 4PVP-KVA This vertical kit for flat ceilings includes a vertical cap for closing off the pipe with a tight seal storm collar to keep water and debris from entering the liner ceiling support firestop spacer to reduce the chances of a fire adjustable flashing for your roof and appliance adaptor to ensure a secure connection to your appliance. Also includes a 3" - 4" appliance adaptor/increaser and support clamp. Pipe lengths not included. Use with pellet oil corn and bio-fuel appliances Laser-welded super ferritic stainless steel inner walls and galvalume outer walls Outer diameter is 5/8" larger than inner diameter 1" clearance to combustibles No additional gaskets or sealants needed The precise fit of twist-lock connections is fast secure and leak resistant. Adaptability is provided by swivel elbow connections and multiple termination options Laser-welded double-wall pipe with a .012†inner wall of corrosion resistant stainless steel and a .018†laser-welded galvalume outer wall. Painted black exterior available. Primary metal-to-metal connection seals joint. Encapsulated O-ring provides a secondary seal.