AC Infinity Room to Room Fan 8”, Two-Way Airflow Through-the-Wall Fan with Temperature Controller, Precise 10-Speed Quiet In-Wall Vent Fan for Kitchen, Laundry Room, and Workshops

I'm writing this from the perspective of a person who is handy around the house, but has never cut any significantly large holes in the walls of his home before, and certainly not TWO significantly large holes in between 2 very important rooms in said house before. If you're THINKING about this as an option, like i did the first time i saw these, you're gonna wanna read this:If you're not a contractor and are familiar with how to measure something like this out and how it works, this is designed to connect TWO rooms and to transfer air from the warmer room to the cooler one, or vice versa in the summer - if you have a (non ducted) heat pump, say...in the front side of your house, but it doesn't heat/cool the back side of your house, you want one of these and yes, you want to cut some big holes in your walls to connect the airflow in between them.you know how they say 'measure twice, cut once'? yeah you're gonna wanna measure like 30 times and make EXACTLY sure the front and back templates (which are provided with this model, but not others) line up. I'm pretty smart and i really had to wrap my brain around the 3D aspect of this. to make it even more complicated, the walls in one room don't terminate at the same place as the other room, so measuring 'to the far wall' was out of my options list. i ended up measuring to a stud (with a stud finder), and then marking and measuring from the nearest one and i STILL didn't line it up exactly. not only did this happen with the first one, but it happened with the second one as well. maybe i'm just terrible at measuring? who knows.once you get the holes lined up, getting the fan in is super easy. give yourself a little extra room on the hole templates. err on the 'outside edge' being a tiny bit bigger, as if you get too close it'll be tight getting both sides to line up. after that you just join the outside to the inside piece and you're done. screw them into the drywall and thats it. i went with the wire going down the wall, as i didn't want to hard wire these.the fans are QUIET until you get past 5 (it goes from 0-10). i have the one in my bedroom at 3 and the one in my hallway at 4 and you can barely hear them. people seem to complain about the complicated nature of the 'features' but they're pretty simple. for example, i choose to use 'cycle' mode. this has 2 modes, cycle on, and cycle off. if you want your fan to run for 45 min and then turn off for 30 min, then repeat the CYCLE, you go to 'cycle on' mode, set 45 min, then hit the button again to get to 'cycle off' and set that for 30 min. easy as that. we're just so used to things being 'app easy now' that we maybe forget how to follow directions. yes, i was confused at first as well lol. to determine 'what' speed it will spin at in any of the modes, you just go to the 'on' setting and set it to whatever number you want it to spin at. if you say, '3' power, every mode, once enacted will spin at 3.in summation, in the winter, the front of my house is a steady 68 degrees with the heat pump on, and the bedroom is like 61, and the even further away studio room is like 60 degrees. with the fans on, in cycle mode, average temp in bedroom is 66 and studio is 65. that's a really healthy adjustment. when we turn the stove on to cook those fans pump all that really hot air all the way to the back of the house and make it feel like we had the furnace on.can't recommend these enough. it requires some thought and work but you can really change your house temperature and save some money with these. i'm certain when we cool the house in the summer it will have the same effect.

I use it to pull air from a very cold concrete and cinder block deep basement into the garage. The wall is drywall over 2" cedar, with 12" between the first floor flooring and the cinder blocks the joists rest on. Used an 8" hole saw and a Milwaukee M12 Haczall(sawzall), removed faceplate and applied fine metal mesh so bugs don't go to the basement. The double garage used to heat up into 90+F on any sunny day, even with AC blowing into it, now 75F steady as the fan kicks in at that temp. Earlier I did order an inline fan with 4" tubing and a wall plate, but realized physics always win, indeed this one moves 300cfm and better believe it.

These work great. Most HVAC systems in homes have insufficient return air flow and many have undesirable room-to-room variations. Using an air velocity gauge, I estimate max flow to be about 200 CFM at max fan speed, rather than the rated 300 CFM. I concur with other reviews regarding noise vs. fan speed. I have these installed both in the floor/ceiling and walls to move air both in and out of rooms and between levels, primarily to get heat from an upstairs wood stove to the downstairs rooms. My units have been run about 500 hours without incident. Install is a little tricky to align the slightly different sized holes on opposite sides of the wall. As others say, a remote control would be nice.

This works great.Only complaint is that the way you set the correct on/off timers/duration is a long way from intuitive, and I’m pretty sure that English was not the first language of the person who wrote the instructions in English. It’s like someone translated the instructions to English, when they had absolutely no idea how to work the device.So, bottom line: You get a fan that works great and just as advertised… and a bonus puzzle to solve. Bright side, People!!

So far so good after installing behind fridge. Cabinets are very close so I installed this to exhaust into the basement stairwell directly behind fridge. 8.8" hole saw (link below) that I had from a different project worked perfectly. Pretty happy with this purchase.Hole saw: https://www.amazon.com/dp/B09XB13772?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1

My install is a little different than most. We built this custom enclosure to house the fan, we are using it to circulate dehumidied air coming out from the far end wall of the basement and across the entire space, creating a loop of fresh dehumidied air. This unit was a key design part for the air circulation. The supply and and return of the stand alone aprilaire install are on on opposite sides of the room of a large L shape basement. I tested this and it works flawlessly. Excellent fan, quiet, powerful. Can be set to continous or timer or whatever you want.