Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan water-filtration A built-in photocell on the

A built-in photocell on the sensor will deactivate CO2 injection during the controller’s night mode

This formula ensures optimum growth

Dishwasher safe and reusable

Package Dimensions:              275mm(L) x 87mm(W) x 94mm(H)

Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan water-filtration A built-in photocell on theA 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