Hon&Guan Quiet 3 Inch Duct Fan with Variable Speed Controller, High Efficiency Inline Fan Mixed Flow Ventilation System Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

We have two vents in our bathroom. One died. When I crawled into the attic to investigate I found that it had been venting directly into the attic as there was only one roof vent available and the other fan was exhausting through it. I started researching options and found that I could cut a new hole in the roof, install a new exhaust, and get a new bathroom vent van; or I could install an in-line duct fan to exhaust both vents through one hole.The in-line duct fan sounds much simpler, but don't be fooled. It was a giant ass pain to reroute wiring, find all the ductwork I needed, sit hunched over in the attic hooking everything up, and rip the guts out of the old vents. But I did it, and now when we run the fan there is only the sound of a gentle breeze. If the prospect of sweating it out in your attic doesn't frighten you off, read on. If you are going to hire someone else to do the sweating...while you're throwing around money, may as well get a higher end fan with a full installation kit (see final paragraph).I have the fan mounted horizontally on a rafter tie, centered between the two vents, with flexible duct hose running to each. Installing this fan is a breeze. The fan itself is connected to the fixture by two clamps. Remove the fan and you have easy access to the mounting block. I simply held it up to the rafter tie and drilled 1/8-in pilot holes, then fastened it with the included screws.I gutted the two existing vents by removing the fans. The shower vent was a combination heat lamp/fan and we wanted to keep the lamp function. It had 12/3 copper coming in, so I identified which wire went to the fan and connected a length of 12/2 that ran outside the box to the location of my Hon&Guan. For the other vent, which is over the toilet, I just pulled the wires completely from switch to fan; I had initially wanted to install three-way switches to control the fan from both locations, but found that additional wiring was required and I wasn't about tearing out walls for this. I used the spot where the switch had been to install an Eaton 7737W night light.I installed a GE push-button timer to control the fan. Works like a charm. The fan itself has multiple installation options for timers, multi-speed, and three-way switches. Diagrams for all of these are included in the tiny user manual.I purchased all of my accessories at Lowe's--4 inch wye branch, two 8-ft lengths of 3-in flexible duct hose, 4-inch backdraft damper, hose clamps, 4-in to 3-in plastic reducers (vents have 3-in exhausts), and a junction box to contain wiring. For all of that I was in about $60.As I was looking at fans, I found two options for full installation kits on Amazon. Panasonic and FanTech both offer these kits that include everything needed. If I was doing a major renovation or new construction, I would probably get one of these kits. Panasonic's kit comes standalone, so you could conceivably use this fan. That kit was my preference, but I found that our roof vent was only 4 inches and that kit is for a 6-in setup.

Variable speed and a standard 3 inch inlet/outlet, relatively quiet. I purchase with a 3 inch outdoor vent and hose/ clamps to vent an XTool S1 Laser. The base of the fan has mounting bracket / holes so you can mount it to a wall / workbench / framing. Fan works quite well at pulling the smoke from the laser cutting and sending it outside.

My 20w diode laser is enclosed in a lexan housing. The housing has a small 12v fan to vent the smoke created by the laser. However, at 60cfm, that little fan just didn't pull enough air to vent the smoke to the outside. I still had some smoke that drifted into the shop.I selected this fan for the 100cfm rating and the low 31db noise level. And it hasn't disappointed. I no longer get smoke in my shop. And I can barely hear the fan when it's operating.The only negative I have is the that the blower does not have an ON/OFF switch. That would have been a nice feature. But the addition of a grounded power adapter switch solved the issue pretty easily.

My situation with this fan is different than most. In my mid-century high rise condominium, we have ambient vents that draw a minimal amount of air from our bathrooms absent any power.Well, these vents were hardly drawing air anymore by the time I bought my unjt. After getting in the line with a dryer vent cleaning extension and getting out as many Reagan-era dust bunnies as I could, I started looking for exhaust plans. My plan was to run a new outlet and put a powered exhaust into the existing footprint.No dice. My vent ductwork goes straight back/through, whereas bathroom exhaust fans vent at a 90 degree angle. I'd have to come up with some PVC pipe contraption with a bunch of elbows to get an exhaust fan to fit this footprint.Enter this fan. It's perfect!!! It looks funky but it does the job. I mounted it to my bathroom wall and have it plugged into a timer so that every time I shower, I get however much exhaust fan time I need. I've had it almost a year (still trying to brainstorm an exhaust fan idea, hah) and if is working beautifully. I mean....it's ugly, but way more importantly, it gets the job done and vents my bathroom.

This fan was purchased to replace a 12 year old in-line bathroom exhaust fan. For the price (cheaper than original) it moves air well, however after a few days it started to vibrate and could be heard on the floor above. I had to access it again in the ceiling to add some bracing to stop the vibration. Now that it’s double braced it works well and is quiet.

I bought this at the end of last heating season and it has sat all summer and fall, waiting for its first use. The first issue that I had happened within ONE DAY of its first use. The blade of the fan cracked and separated from spindle. OK... I super-glued it and it worked for about a week more until it began to separate again and make noise with contact to the housing. Now, ONE WEEK later the motor has died completely. Appeal sent to the manufacturer with no reply. Do NOT trust these products made of the cheapest possible materials. Total garbage.

Installed this fan on roof vent. It provides continuous 24/7 ventilation on a commercial bathroom. It has been installed for about 6 months. Still running just fine.

Install was a breeze replaced a 180 dollar s&p fan installed by the builder which died in less than two years, HVAC company was asking 40 dollars to replace and with no warranty. This fan cost less than that and has a lifetime warranty, and the noise level is so low, I can barely hear it running. The fan it replaced had to be put on a timer to not run during the night as it got too loud and interrupted sleep. Mind you this fan is in the garage, and could hear it in the master bedroom. This fan is a God send....