Inline Duct Fan 5'' Super Silent 22dB 280 CBM Pre-Wired 2 Speed-Level Exhaust Fan Air Booster for Grow Tent/Hydroponics/Air Exhaust/Ventilation/Smoke Moving

I bought this fan and am impressed with its design, performance and quietness....BUT....I worry that the fan has no stickers from UL or CSA or HVI proving North American safety standards are met. There are no safety stickers on this product of any kind.

Look at specs carefully, it isn't a 4inch inline duct. It's really a 5inch and will never fit a standard 4inch duct.

Bought this fan in March 2020- almost lasted 1 year. Worked very well & quiet while it lasted. Save money & get an AC Infinity fan.

Quiet and powerful

Hey 5" it stated it is a 5". They also listed an adapter. Just saying..