Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan ventilation intense light coverage with its

intense light coverage with its 8 passively cooled LED bars allowing you to use it in low rooms

The pH level of soils or substrates strongly influences crop performance

These highly porous large stones are lightweight

(NOTE: Not compatible with MAC systems

Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan ventilation intense light coverage with itsA 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