TerraBloom 4 Inch (100 mm) Inline Fan - 188 CFM Exhaust Duct Fan, Built-In Speed Controller, ETL Listed, Pre-Wired 6 FT Grounded Cord - For Use In Grow Tents With Carbon Filters, Fixtures, Attics

Très satisfait Niveau de son très bien plus silencieux que mon air assist ou de mon imprimante 3d Il tire toute la fumée que mon laser peut faire je recommande Reste à voir avec le temps mais il est garanti 2 ans

Works great for my tent. Seems like it moves alot of air. Not super loud either.... But not quiet if that makes sense. Built in speed controller helps some with noise. Satisfied with the product so far

I bought this along with the duct pipe and carbon filter grudgingly at first; I thought it would be overkill. However, I made a mistake and hung my thermometer/humidity gauge on the wall and not the mat. It was 85 and great on the wall, but it was 100 degrees F and 26% humidity on the mat under the light. I changed my setup to a negative pressure tent, closed all but one vent and let this fan take hot air from the top of the tent, filter it and blow it out the bottom air hole. I moved some stuff around and added a small fan inside. All of a sudden, happy plants and one even came back from "the dead". Perfect 85 F and 40% RH on the mat. The air coming out is enough to heat a bedroom on its own, so one room is literally heated just by the tent and LED lights. Great buy.

I purchased this unit to provide outside fresh air for a 4x4 grow tent. The fan works well until I attach a 4"HEPA filter .. it struggles to move air. I was under the assumption that any restrictions, ie. 90 degree elbows, long runs of duct,etc, would reduce the cfm by half, which is why I believed it would still provide good airflow ... I think my assumption was faulty because it cut the flow to almost zero. I should have opted for a more powerful fan. Without the filter, this unit works as described and maintained the optimal temperature in the tent.

I love this 4" fan for my purposes and it is very quiet and extra quiet with the carbon filter attached perfect for a tiny tent but anything bigger and you will need a larger size to remove heat.