Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan ventilation These highly porous large stones

These highly porous large stones are lightweight

Comes with GL45 screw cap to prevent leaks

Recommended for larger

Each 340g pouch treats up to 68 plants

RAW Classic Connoisseur 1¼ has everything you need to roll your own RAWthentic smokes in one easy-to-carry package

Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan ventilation These highly porous large stonesA duct muffler designed for use with inline fans in grow tents, bathroom fans and other HVAC applications. Features dual aluminum flanges to help absorb sound waves from fan vibrations and airflow. High quality neoprene foam in an egg crate pattern that will reduce fan noise by up to 50%. Galvanized steel body that is corrosion resistant and can withstand extreme temperatures. Duct Opening Diameter: 4 inches Length: 15 inches Weight: 2. 30 pounds