Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan microbial fertilizer In hot weather its best

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

If your Ph is getting too high

works great with 20 gallon industrial Rubbermaid tubs

New Spider Farmer 90cm x 90cm x 180cm Indoor Grow Tent

Duct Fan Silencer 4 - Duct Fan Silencer for 4" Duct Fan microbial fertilizer In hot weather its bestA 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