Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan microbial fertilizer Maximize your yield while minimizing

Maximize your yield while minimizing power consumption

In hot weather its best to spray in the morning or evening because dwell time determines effectiveness

works great with 20 gallon industrial Rubbermaid tubs

and works with 1000W Interlux Double Ended lamps (and most other brands)

Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan microbial fertilizer Maximize your yield while minimizingA 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