They can be used for flue gas, ventilation ducts, etc. Designed to protect pipes from precipitation, as well as to increase traction.
Stainless Steel Chimney Spinner Cowl Rotating Anti Downdraft Flue Cap 80–200mm
Chimney Spark Arrestor Flue Liner Rain Cap Cowl Duct Pipe Cover Protector
Chimney Anti-Wind Cowl Flue Liner Spark Arrestor Rain Cap Duct Pipe Cover
Chimney Anti-Wind Cowl Flue Liner Spark Arrestor Rain Duct Pipe Cover Protector
Stainless Steel Chimney Cowl Flue Liner Cap Stove Pipe Rain Cover Duct Closure
Chimney Cowl Flue Liner Cap Stove Pipe Rain Cover Stainless Steel Duct Mushroom
