Duct Fan Silencer 6 - Duct Fan Silencer for 6" Duct Fan ph-ec-tds-meters-and-solutions This blend includes calcium

This blend includes calcium

Speeds drainage

Wicking mat for auto watering

landscape plants

Proven to reduce more noise than any other muffler available

Duct Fan Silencer 6 - Duct Fan Silencer for 6" Duct Fan ph-ec-tds-meters-and-solutions This blend includes calciumA 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: 6 inches Length: 20 inches Weight: 3. 90 pounds