Hon&Guan 3 Inch Duct Fan, High Efficiency Inline Mixed Flow Ventilation System Exhaust Air Fan for Bathroom, Kitchen, Grow Tent, 3D Printer

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.

It has a good airflow as an additional air vent to pull fumes out of my cragt room where my laser engraver is. I wish there was a on off switch instead of having to plug and unplug it. It is a little bulky but has holes to mount up if needed. For the value it's good, but if you need something strong I would suggest a different one.

I really liked the product. I just didn't work for what I needed. I would recommend it to anyone.

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.

This seemed like a decently made inexpensive fan but it failed after very little use on a timer activated system.

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....

I use it for the smoke created by a laser engraver. Works well and pushes smoke a long distance.