4 Inch Inline Duct Fans Plastic Housing, 160 CFM Ventilation Exhaust Fan Ideal for Indoor Heating Cooling Transfer Or Grow Tents Air Boosting, With Variable Speed Controller

Easy to set up, extremely powerful even at half power, so much better than the one I have been using. I’ve had it running for a day, half power and seems fine, only time will tell. I would definitely recommend getting one 😊

Easy to connect & use, come with adequate flexible hose, no vibration even at higher speed. Expected volume at full extract but still acceptable, easily slowed dry until quite & still moving a lot of air.May buy another for the other area of direct extract above another resin printer, it's that sort of value.

Does exactly as advertised time will tell if reliability is an issue

Strong fan that can be used in a variety of ways. Powerful in terms of airflow and isn't that noisy so not too disturbing. Good value for this item as its made from.high quality materials in Japan.

Good stuff, enough airflow for 4 Inch fan; no loud apart from air flow noise.

Not as powerful as others but you get what you pay for I suppose

This arrived very well packaged with clear instructions and everything you need.When you unpack, you need to connect the speed controller cable and speed controller which takes a few seconds. The fan unit and speed controller have holes so you can mount this anywhere you like in a secure fashion.Using the fan, there is a clear marker indicating the direction of rotation. It is surprisingly quiet considering how much air this can move. On high it's powerful for sure, moving a lot of air and speed controller allows you to set this at whatever speed or noise level works for you. I noted you cannot turn this down to minimum quickly as it will turn it off, if you want to go to the slowest speed, you need to find the sweet spot on the controller. A suggestion for the future would be to have the lowest setting as low (not off) then a separate switch or push the switch for on/off.All in all, this is a well built unit, with everything you need to move lots of air quickly and varying speeds.

I got this for ventilation in my 3d print room and once fitted with a length off 4inch hose which is around £10 on amazon and the other end put out off the window its absolutly amazing very quiet in operation very very powerfull and robust and even has flanges to fasten it down THIS THING HAS A KICK LIKE A MULEIt even comes prewired which i found very convienient its a really super pump very highly recomended