Apollo Horticulture 4" Inch 190 CFM Inline Duct Fan with Built in Variable Speed Controller for Ventilation

Upon unboxing the item, I was pleasantly surprised to see that the fan was constructed in durable materials. While the 4" version is anemically weak in all but it's max setting, the 6" blows a good amount of air. Don't fool yourself into believing the 4" model will flow 190CFM. I doubt it would flow that in free air, but it certainly won't hold up to static pressure of 90 degree elbows or carbon filters like a centrifugal fan design will. Furthermore, I do not believe it will flow enough through a carbon filter to b of use to many people. The main problem with this design is its cheap motor and fan control. This thing really hums which makes me question whether it is a variable speed motor, or if it is just a AC motor with a rheostat. Several articles state that attaching a rheostat (dimmer) to a fan is a serious fire hazard, and I did see where another customer showed one that caught on fire. The manufacturer states that the fan registers less than or equal to 30 decibels (dB). I measured it at 1 meter at 56dB on low and 65dB on high. The manufacturer must have been measuring from an adjacent room or some other deceptive manner. For exhausting bathrooms silently look at the Panasonic Whisper line and never look back. If you need a quiet, small inline, everyone is impressed by Soler & Palau. This seems like a decent fan, but if you are going to put up with the noise, why not get a better constructed metal centrifugal fan? This fan idea has promise, but they need to get a properly designed 3-speed motor that has specific windings to each speed. This should eliminate the hum and make a great product. While I gave the 6" model 3 stars for at least moving air forcefully, I gave the 4" 2 stars for being very weak. (I've posted details of the 6" model on the relevant page)

A great fan for the price. I've used other duct fans in the past and they are cumbersome and loud. This is just the right size and virtually silent. I highly recommend this fan for those who don't need the fastest most expensive fans.As a 20 year member of Amazon I rely on independent reviews when shopping. Therefore, I will always try to be as honest and impartial as I can and will try to provide helpful insight into the product. I am reviewing this product as it relates to how it works for me in my intended use. Your needs and experiences may of course be different. I tend to review products that I really like, or that let me down in some manner. If you found this review helpful, then please click the "HELPFUL" link below! Thank you, and HAPPY SHOPPING!

This product sucks the air out of my Apollo 4'x4'x7' grow tent just fine. It is sitting on a shelf 2ft. above said tent and pulls air out thru a 6" carbon filter inside and then pushed 10' thru to a vent in my ceiling and out an 8" roof vent. It's been on and running quietly 24/7 since the moment it arrived well packaged 2 months ago. Awesome fan to exhaust a small indoor area. The variable speed is a nice feature as during certain phases of growing and/or climate conditions require more or less flow at times. The unit can sit/rest on a shelf or has holes in the base to accommodate wall/ceiling mounting. I have 3 now, one in a grow tent, one in a dry tent and a back up just in case.

For the price, this is a solid little setup. The long winded 1 & 2 star reviews that are trying to sound all technical are written by penny-wise and pound-foolish THC-fueled social miscreants. To get the mounting bracket, long power cable, and control knob for this price is extremely reasonable. The noise level is acceptable. I run a camouflaged operation in plain sight so that house guest are none the wiser. A simple box fan on low or a radio at about 30% is all it takes to cover the sound of a proper install job. The vent fan on my microwave over my stove is far louder. I'm ordering a second one right now to affix on the back of my dryer as a variable speed booster.

Very happy with it. Quieter than I thought it would be and more powerful. Have a 12 x 13 utility room and removes air and odors very quickly. Have 25 foot horizontal 4" flex duct run to outside and the air coming out of vent is nice and strong. I usually run it at full on and it does run with a hum at lower speeds as with most all variable ones but noise is not a concern with my operation. Do not really know if the CFM is really 190 or if the wattage usage is really that low at 35 or so, but all in all I did my research and had lots of choices for what I wanted and so far glad with purchase and would recommend.

Let me first say that this is NOT 190 CFM but it was meeting my needs. Now that I need a full 190 CFM, it is not meeting my needs.Also, over time, it has begun making a subtle noise that it did not make in the beginning.In summary: If you want a cheap fan and do not need perfect quietness and not full 190 CFM, this is a great value. If you want full 190 CFM, I would recommend coughing up the money and buying a higher quality fan. What I'm learning with grow equipment is you get what you pay for.

I was hesitant to buy this at first due to a few bad reviews. I decided to take a chance and I'm pleased with the outcome. The fan was on 24/7 the past two weeks without fail. I would buy it again. I wish it had a hook or something on the bottom/top for grow room hooks/rings. There is a removable plate with screw holes if you want to attach it to the wall or ???

Tried plugging it in and turning it on when I first got it and it wouldn't work. A screw on the fan speed control box was drivin through a wire upon assembally . Luckly for me I was replacing the speed switch with a humistat anyway but crappy craftsmen ship for sure.Also the fan is very unbalanced and causes a lot of vibration.I was going to mount it to the bottom of the floor in the crawl space but the vibration through the floor could be heard throughout the entire 2 story 2000 sqft house.Resorted in mounting it to a chunk of 6x6 post and setting in on the gravel instead it was that bad.Only giving it 2 stars because it at least works and has high air volume for what it is. Wouldn't recommend this as a first choice though.