iPower 10 Inch 862 CFM Inline Duct Ventilation Fan HVAC Exhaust Blower for Grow Tent, Grounded Power CordRecycled Claim Standard 100

I seriously don't doubt the CFM ratings for this whatsoever. It's a bit loud on high, but this is easy to fix (it's completely dependent on the ducting. No sound comes through the casing.And it's definitely a solid machine. YES it leaks a bit of air around the sheet metal connection between the front and the back, but it's pretty sturdy (and heavy). TBH though, I'm amazed my unit still works and barely any vibration...I've dropped it or it came loose and fell 5 feet and rolled another 3 feet more than once. Mine is 6" and is just awkward to hold and mount. And I put a single layer of gorilla tape or clear duct tape (not packing tape!) Around the 2 flanges. As they're only about an inch long.but semi rigid aluminum tube stays fine with a clamp. And definitely don't use anything less smooth like flexible ducting tube on the intake (see below). 12" and the blower sounded like it was really going, but it was barely moving 1/3 of what it's rated...The mount is nothing to write home about and it's good enough to mount on bungee cords hanging from a 12" L-Bracket right to a stud (it definitely vibrates on different speeds. (Get a $5 controller from Amazon. My first one wouldn't get hot running a shop vac and the second was a 4-pack for $11). And don't go below 1/2 speed (by airflow).BTW I did my research on this type of blower and you're not supposed to slow it down with basically a glorified light dimmer, but the intake restriction is how you would tweak the volume under varying loads, etc. If you block the output, it will ramp up the power to try and compensate... But very slight changes to the input really change the output while it remains at more or less constant speed. So put a grille obviously and you want something for a muffler (1 or 2 sizes larger tubing with coarse wire mesh in the correct diameter and polyester pillow fill between the rigid outside and the mesh tube, so I did 7" with a 1/2" mesh and 10 or 12" (or 2 home depot buckets long, but one might do it. Look at commercial duct silencers online for restaurants, etc and you'll get an idea what's needed physically for components.HTH

A quiet beast

I bought this for my 32x32x62 Grow Tent and I couldn't be happier. I was relying on 3 crappy $6 6 inch Lorell fans to do the ventilating and create a breeze on my marijuana plants. This wasn't working well, I cheaped out on fans because I was already investing over $400 at once to get this grow started. I bought this fan a month later when the R/W/B Spectrum settings needed to be set to 100%/100%/100%, this brightness increase came with an overall temperature increase. My tent was reaching 82 degrees fahrenheit and with humidity levels of 40%-50% the plants were suffering from heat stress. This was in an air conditioned room set to 64 degrees, and still it was reaching those temps. I was uncomfortable due to the cold, and my plants were still uncomfortable from the heat.Now that I have this inline fan, I stuck some ducting down to the lamp's heatsinks to suck heat directly from the light, while the majority of the ducting is still sucking air from the tent and drawing in a nice breeze through the screens on the bottom of the tent. My temps never go higher than 75 now, averaging 72, and thats with my room now at 68 degrees. I used 2 of those 3 fans to blow directly on my 2 plants as well, I'd say my setup is pretty ideal, only missing a filter now and speed control now. I'm comfortable and so are my plants this inline fan was a win win.For those who know nothing about inline fans such as myself. If you're wondering how this fan type compares to your basic lorell 6 inch fan its pretty much incomparable. The performance of this fan is around 50x greater than the ones I was using. They do not work the same way either. inline fans create suction or air pressure, while your basic fan creates air flow. This inline fan also helps to suck out light debris that may get into the tent keeping the grow cleaner. For example small hairs from your pet, if there is enough suction inside the tent it will be launched out instead of settling on the plant or inside the tent. Or those small flying bugs that want to eat your plants.I do not use a speed controller, I have it running 100% all the time. I'm going to buy one and have it set to 85% if that's possible.

Great specs - best CFM and high temperature tolerance in this price range. It moves more air and can tolerate higher temperature than most other fans anywhere close. I got this to help ventilate an attic, but it is installed in an area that does not get as hot as where it's helping ventilate. Unfortunately, my first one started squealing after only 2 days and had to be replaced. This was handled hassle-free by Amazon. I realize there is a certain expected failure rate coming out of manufacturing and I may have just gotten a bad one through luck of the draw and will update this review either up or down from the initial 4 stars based on how long the replacement lasts.TIP: When mounting, use rubber or nylon washers to help reduce transmitted vibration. Also you can't really get a screwdriver lined up very well from above, so consider either running the screws up from beneath with lock-washers on top, or use hex-head screws so can use a tool to hold the top still better while you tighten your washers beneath. Pay attention to the arrow which indicates the direction of air flow.When choosing whether to push air in or pull air out, consider the overall airflow of the space and whether you want to create a positive or negative pressure. Many will default to using such a fan to pull air out, but in some cases you could be better off pushing fresh air in and letting that force out the existing air. What is safe and appropriate depends entirely on your application and you should consult local building codes.