Automatic Duct Fan 100mm, Inline Fan with Differential Fan Pressure Switch, Air Vent Booster for Industrial HVAC Ducting Ventilation Exhaust Systems, 4-Inch

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.

I needed to supplement my dryer vent, as my vent ran pretty long to the outside of my house. I installed this in the middle and it works great! It is pretty quiet and has enough air flow to do the job. The pressure switch works well and adds to the convenience. Installation is easy! I'm very happy!

Easy to install. Automatic turn on/off via pressure sensing is great. This allows me to installed it in the attic. My pipe run up 10' wall then turn 45 degree for 5' then run to the roof for another 4' or so. I guess this was too long for the new LG dryer because if keeps throwing the d80 code. The fan was installed on a 45 degree without any problem with the flexible hose + clamps. No mode d80 code from the LG dryer and the clothes dry so much faster.

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.

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.