Best Household Ventilation Fans in 2020

AC Infinity CLOUDLINE T4, Quiet 4” Inline Duct Fan with Temperature Humidity Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics Review:

This is a great, super quiet fan. I'm using it inside a "VIVOSUN 36"x36"x72"" grow tent and I love the fan on/off automation based on the temperature probe. Previously I was using the manual "VIVOSUN 4 Inch 203 CFM Inline Duct Fan" which was very loud (50+ dB/decibels) and had no temperature probe to help the fan kick on/off based on the temps throughout the day within the tent.

This is probably the best inline fan for a small grow tent on Amazon based on my research.

I gave this 4 stars because of a couple small items that I think can be improved:
1. when the fan temperature probe reaches the temperature threshold, is turns itself on but it will run at a speed you preset from the ON mode. So your presetting the speed it will run at when it kicks on which may or many not be adequate to reduce the temperature in a tent. It would be better if the fan kicked on when it reaches the temperature threshold but then slowly ramps itself up over time if the temperature is not decreasing fast enough. This functionality probably would have been difficult to implement with the control panel display thing thats bundled with the product.
2. Mobile app - it would be nice if there was a mobile app integrated with this fan so you could remotely monitor the temps and also setup a setting like I described above - slowly ramp up the fan speed if the temperatures are not decreasing within X minutes.
3. When I initially installed the fan and turned ON, it would try to spin but would stop as if it wasn't getting enough power. The control panel displayed a little triangle with exclamation mark and per the manual that means something is not right and call customer support (no troubleshoot tips). I checked the fan and tried spinning the blades manually but it was sticking. I had to dismantle (how its described in the instructions when you wall mount it) and I found that the "wing circle" part was loose and causing the blades to rub. After fixing this and re-assembling it worked fine.

Overall very happy with the product. I imagine another upgrade of this fan that includes a mobile app would really put it far ahead of other inline fans out there.

iLIVING ILG8SF7V Shutter Exhaust Fan, 7" - Variable, Silver Review:

I live in the Pacific Northwest where cold weather and rain can combine to create a condensation problem. After adding a garage to my home I found that condensation would form on the garage door windows and walls after I'd pulled my warm, wet car in during wintery conditions. After trying electric heaters and dehumidifiers without success, I bought this fan and installed in on a side wall about 7' off the ground and wired it to a Panasonic condensation switchPanasonic FV-WCCS1-W WhisperControl Three-Function On/Off Switch, White. (I also wired the recommended iLIVING ILG8SFSC Solid State Variable Adjustable Precision Fan Speed Controller iLIVING ILG8SFSC Solid State Variable Adjustable Precision Fan Speed Controller 120V 8A but have just set it to high and left it alone.) The dimensions were perfect for installation between studs. I created a box between the studs by nailing two 2x6" horizontally above and below the hole that I created to mount the fan, to tie the exterior and interiors walls together and prevent it from drawing air in from the interior of the wall. I installed a vent to the attic of the garage so that the fresh air source was the relatively drier air pulled from outside, from the eves, through the attic and down into the garage. After patiently adjusting the sensitivity of the condensation switch, it now comes on only when needed and shuts off when the car, and the air in the garage, is dry. Works perfectly, not too loud and moves a ton of air.

Broan-NuTone 678 Ventilation Fan and Light Combination, 50 CFM 2.5-Sones Review:

Very good quality, not too loud, simple electrical installation! This van fit perfectly, and looks beautiful. I replaced a similar sized fan without a light in it, but had the switch available on the wall outlet to wire both the light and fan separately. The wiring is simple and easy, just needing to connect one black, one white and one ground for the light, and repeat 3-wires for fan. Inside the unit housing the electrical components simply have two prong outlets and corresponding colored plugs to make the final connection. You can boost our lighting to 100 watts output with an LED bulb. I have installed four different units and this was the easiest by far.
I would caution you to wear a pair of work gloves, especially since I did manage to cut my hands twice on the metal.
If your ventilation hose does not fit this unit, you can buy a "funnel" shaped adaptor for less than $6 at the Big Box Stores.

Broan-NuTone 690 Broan Bathroom Exhaust Fan Upgrade Kit, 3.0 Sones, 60 CFM, Neutral Review:

Bought this to repair number of 25 year old Broan 688 fans that were part of the new house build. The old fans were loud and rumbly. This was a real easy install. Took longer to clean all the dust that fell out of the old motor than it did to install this. Probably 30 minutes from start to finish per bathroom with at least half of that clean up time.

Only giving it 4 stars because I would still consider this kit somewhat loud. A huge improvement over the old fans, like I said but those were 25 years old and pretty much wrecked. One didn't even work anymore and the others the bearings were worn out.

For dB comparison, the best working of the old fans registers 65dB on my phone app. The new fans register 60. This is in the bathroom with the door closed an d me inside. If I open the door and stand outside it drops to 55. If I close the door and stand outside it registers 50. I forgot to test the old fans in similar cases except inside the bathroom with the door closed, but I can tell you that I could walk down the hallway in the past and still hear the old fans. The new fans fade away pretty well as you walk away the sound simply does not carry like the old rumbly ones.

For reference, I did replace one of my fans with a 1 sone unit for about this same price as this. While it is quiet, like literally whisper quiet while moving the same amount of air, the install was a pain. 50% of the trouble was getting the old Broan unit out. The ther 50% of the trouble was getting teh new unit with short wire leads wired up and up into the vent space. I only took the trouble to do this because I have two daughters and their they refuse to use the louder fan when they shower, so the room fills up with steam. I figured it was a good investment. The rest of the house got these replacement motor kits.

Panasonic FV-08-11VF5 WhisperFitEZ Fan 80 or 110 CFM Review:

5 Star Fan, 2 Star Directions

The fan is nice, pretty quiet, even at 110 CFM, and though I thought the nightlight was LED (it's not), the color and quantity of light is pretty ideal.
The instructions are some of the worst I've followed over the years and that pains me as I literally used to produce them for Panasonic's electronics.

On those instructions:
I spent far longer than necessary last night installing this fan, although I confess to being quite tired when I started the work. I followed the "Retrofit" instructions, with crappy little diagrams and jumps back and forth between the "New Construction" and "Retrofit" instructions. To save others the headache, my major mistake was on page 8, step 3. I couldn't tell that Figure 4 shows that the "adapter" is supposed to go UNDER the ceiling sheet rock. I installed it on top of the Flex-Z Fast bracket leading to an hour of major frustration crawling around the attic thinking something was jammed. Once I got that figured was pretty straightforward. I'd like to have had another screw to secure the corner (one 3 corners are actually screwed into the bracket). Also, as others have mentioned, the 10 7/8" hole, which I had to cut, is a bit bigger than needed. 10.5" is pretty safe, but you can caulk any gaps. And the cardboard template is not the size you need to cut.

Other notes:
-Use a dropcloth - especially if you have loose fill insulation and/or need to enlarge the ceiling hole.
-Wear gloves...fiberglass insulation itches
-You might need to get into the attic to straighten the duct
-The grill mount with the springs is a little odd (once again, the instructions are terrible), but pretty ingenious
-Use caulk for the edges to seal it up nicely once you're done
Would I buy and do it again? Yes, I'm going to do my other bathroom...

VIVOSUN 6 inch Inline Duct Booster Fan 240 CFM, HVAC Exhaust Intake Fan, Low Noise & Extra Long 5.5' Grounded Power Cord Review:

 The fan may not be super quiet but if you get a speed controller it will help with the noise. I still recommend getting the inline fan but only use the booster as a supplement. Customer service tried to help with my problem and they blew my mind on how helpful they were. Awesome customer service brings it back up to 5/5, thanks for reaching out to me Vivosun!

VIVOSUN 4 inch Inline Duct Booster Fan 100 CFM, HVAC Exhaust Intake Fan, Low Noise & Extra Long 5.5' Grounded Power Cord Review:

 The fan may not be super quiet but if you get a speed controller it will help with the noise. I still recommend getting the inline fan but only use the booster as a supplement. Customer service tried to help with my problem and they blew my mind on how helpful they were. Awesome customer service brings it back up to 5/5, thanks for reaching out to me Vivosun!

Broan-Nutone 665RP Heater, Fan, and Light Combo for Bathroom and Home, 4.0 Sones, 1300-Watt Heater, 100-Watt Light, 70 CFM Review:

I bought this one to check it out for a house that we're rehabbing
This one is a bit smaller but still pumps out the heat and has
a decent exhaust fan (4 Sones). There is no night light in it- something
I will remedy by hooking the light up to a dimmer. Overall this unit
should last as well as my old one It's a tried and true design
and built well- but in China.
It calls for a dedicated 20A 120V circuit though at 1250 watts
it should run OK on a 15A circuit if not shared with any other big loads- esp a hair dryer.
At the current price it is a bargain for installation from above.

However, I agree with Hari Nair- As a retrofit it has a serious design flaw. It
is difficult to install from below- something that could have and should have been
accommodated at the design stage. It can made to work by cutting off the
external mounting ears and drilling some holes to screw it directly to the joist
from inside the housing. Then, with a strong and patient person holding it close to the ceiling you can push
the wires through the wiring cover and wire nut them to the various connections. then attach the cover with
its' one screw (too bad the cover doesnt have a keyhole for the screw) and then you and your helper can push the unit through the opening and screw it to the joist.
I know this works because we did it last week- but it certainly isnt easy.
I have always thought that designers who are too lazy to think about the end user and installer should
be sentenced to installing and repairing their designs for a month. Design Supervisors who tolerate such
laziness should get 2 months.
I'm subtracting a star for Nutones's failure to accommodate retrofit applications.