Automatic Duct Fan 4" Inline Fan. | With Differential Pressure Switch, Air Vent Booster Fan for Industrial HVAC Ducting Ventilation Exhaust Systems

It's a great basic duct booster fan. It's a simple design. Great value! The airflow is great with minimal noise.

Very good. Not noisy Automatic great. Boosts under power microwave. No more kitchen smells or false smoke alarms

It provides the added venting so that my dryer doesn't give me an error code due to insufficient venting. Increases clothes drying efficiency. It did stop working for a couple of weeks, but has been doing the job for most of the 2 years I have owned it.

Works great. Set on speed 2. Master bedroom now same temperature as the rest of the house. Room was always hotter by about 2-3 degrees during the summer. Super quiet. Fan settings remain the same if power outage occurs and then power returns. I bought the home depot ferncos. Should have gotten this a few years back. Easy installation.

I have a large house that has a very long dryer vent line. I didn't realize this until I burned out two heating elements in the dryer and then finally figured out that it was because the dryer vent line was so long. I put in this blower which turns on and off automatically and I could not be happier with it. I would recommend this to anybody that has a dryer vent line longer than 6 to 8 ft.

Pressure switch breaks easily, and AC Infinity really makes you jump through hoops and pay to get it fixed - avoid this cheap blower and go with something more reliable!

Three-stars because, when the fan is on, it pushes air through the ducts like it is supposed to. However, the air pressure is way to sensitive, as it will kick on constantly, even when the HVAC system is not on. I went to customer service and they gave me the runaround - if there were additional ratings for the customer service, I would give them a one-star. I'm sure it would be a 5-star product had I received a good unit that worked like it was supposed to, as I believe this one slipped by quality control. Noise level seems to be high as well, as it is in our attic crawl space and I can hear it through the ceiling/walls and that is how I know it's running when the A/C or Heat isn't running.

Works great as a dryer vent booster. I relocated the dryer vent as the rear deck is now blocking it, vent hose now travels quite a bit of distance and a few sharp turns. My cloths are not getting dryed as before. Installed this inline fan. It turns on automatically when my dryer turns on. Then it turns off after a minute. I'm a bit concerned about it getting too hot. Been drying it in medium heat setting. Cloths are still getting very dry. Works perfectly.

Triggers reliably, relatively quiet. I'm using this as a make up air unit for my laundry room. I put the pitot tube on my dryer, while the fan is just behind a damper on an intake duct. Because of the intended use as a booster, this is programmed to shut off for a bit every five minutes to see if there is still flow with the motor off. For my use I wish there was a mode that doesn't need to shut off to sense, as the fan is on a different duct. This is still a very affordable universal make up air unit.

It works! Used to boost airflow to far end of house from a concealed duct heat pump. The automatic pressure detect works perfectly. I can even set my heat pump to 1% fan speed and the unit still detects the pressure difference and turns on! Glad i found it. Seems like a better option than the floor register boosters.

Très bon produit et facile à installer.

AUTO works but not when the unit is in up position. I had to tern it sideway a bit at about 45 degrees angle. In this position AUTO works well.

Noise/results My house is a 1955 slab build, with an add on kitchen/basement in the mid 70's. The downflow hvac system didnt have enough gusto to push heat to the add on registers, or there were restrictions/collapse in the old perimeter in slab ducting. I put this on the only exposed ducting i could access in the addon, about 50' direct line, but would probably be 75 or so of ducting run. The unit itself is quiet, fairly easy to install and the pressure swtich works great. I have it on setting 3 and it works well puahing more heat to the area but also drawing more heat through the whole ducting system, making all the registers work better. It has prevented our furnace/Thermostat (ecobee) from over heating and shutting off which has been an annoying regular winter occurrence. It is actually a pretty loud system, as the fan winding travels through the ducting and out the register. I have this on a 20' run with two registers, and the noise it produces is substantial. My wife coverwd up a register this morning just so she could watch a show. I'm going to try and insulate the ducting to hopefully absorb some sound vibrations. This solved and problem, and presented another. So we'll see what happens.