AC Infinity 120mm Muffin Fan with Speed Controller, 4.7 inches, Fan, for Room to Room, Wood Stove, Fireplace, Circulation Projects

I mounted this fan in one upper corner of the doorway into a bedroom, in order to blow some warm air from the hallway into the bedroom. Even though the fan is "free-hanging" without any external ducting, it does fairly well at bringing in some warmth without producing very noticeable noise (when running at low-to-medium speeds. The fan does make noise when running at full speed that is noticeable, but not loud, at 10'-15' away). The mounting brackets allow various mounting options, and the one I used allows the fan to be "aimed" at a desired horizontal angle, which is helpful for directing the air flow in the optimal direction into the room. The speed controller is built in-line on the power cord, and can be mounted to a surface if desired. The only problems that I encountered were sort of specific to my situation: First, the hardwood door frame did not accept the mounting screws easily - even after I drilled some "pilot holes". Second, I did not mount the speed controller, and it's free-hanging weight caused the power cord to pull off of the terminals of the fan - so I had to tie that end of the power cord to the fan as a strain-relief. Another potential problem is that an extension cord may be needed if there is no electrical outlet nearby. (In my application, there is an outlet next to, and outside of, the door within 5' of the fan, so the cord can be plugged in without an extension, and without interfering with closing the door). Despite the minor challenges of mounting to my door frame, and a lack of aesthetics, the bottom line is that the fan moves warmth into the bedroom with barely noticeable noise, so it does well the job that I want it to do.

This is quiet for the volume of air it can supply. Adjustment ranges from about 40 cfm at 4" diameter, up to over 100 cfm at full speed - sound level proportional to flow.

三年ほど前に購入して、夏冬問わずに活躍ぶりを見せてくれている優秀なファン。　風量を抑え気味にすれば就寝中にも気にならないほどの静音で、クーラーの補助用として扇風機とともに電気代の節約にも一役買ってくれます。　…が、買い増しをしようと検索してみるとなんと価格がおよそ三倍。　AC infinityブランド全体が三倍から五倍程度に価格上昇しており、様々な事情や思惑での価格設定なのでしょうが、さすがにこの価格では購入は見送らざるを得ませんでした。　いつか落ち着いた価格になる日は来るのか…？

Good quality

We heat our home with a gas log insert and were looking for something to move air into a couple of rooms. We decided to try this fan with the idea of placing it in the upper corner of the door frame.First off, we noticed the fan was built with quality in mind. No rough edges, very solid materials used for each component and easy to assemble. About all you need to do is attach the grills that are quite nice and well aligned with the holes in the body of the fan. This model comes with a speed controller which operates very smoothly through the entire range. Also comes with a mounting bracket (also well built) and easy to install.The fan really does perform well. and moves A LOT of air. When running on high there is some noise but not much for the volume of air it movesAll in all the fan was easy to assemble easy to install and really surprised us with its performance and construction quality. We do plan on getting another one. Perhaps it will be the model with two fans.Great Product.