Tjernlund V2D UnderAire Crawlspace Ventilator Fan: Reduce Moisture and Mold, 220 CFM

Gregory H. Talley: My friend installed it for me because it's difficult for me to bend and turn in small spaces. I'm a senior citizen with disabilities from my 30 year military service.

United States on Oct 20, 2023

William: I considered making my own but the cost for me to make one was more than the cost of two of these! The important feature is the humidistat. Set it where you want to maintain the humidity level and that's it! It shuts off at 35F so no worries about a cold air draft freeing your pipes.

United States on Sep 09, 2023

jpatton: This was needed to keep my crawl space drier after extensive water related issues were treated under my bedroom. Because this was a poorly done addition to this house, the crawl space is very low. Therefore the foundation vents are only about a foot beneath the subfloor. This fan is actually under my bed area. I can hear a gentle whirring noise when it is on. I choose to think of it as white noise, and it really doesn’t bother me. I know it’s helping pull moisture out, which is important, so I choose to not be bothered by the sound. The wiring is behind my wall.

United States on Jul 20, 2023

AdrianAdrian: We had our crawlspace encapsulated last year and they didn't install an exhaust fan. Pretty soon we started to get the "cat pee" smell in the house that a lot of people seem to experience, which is actually ammonia being released from the soil. I didn't want to pay to have them come back and install a fan (which they should have done originally, but I didn't know that at the time), so I bought the Tjernlund V2D to install myself.

When I unboxed the fan it looked good and didn't feel cheap. I noticed that the frame was a little warped, but it easily flattened out when I screwed it in place, so this wasn't a big deal. Installation was pretty easy, but will vary depending on your situation. The vent opening I chose was larger than the fan, so I used some scrap plywood to make a frame. I secured the wood frame to the cinderblock with concrete screws and then secured the fan to the wood frame. I had to run a short extension cord to reach an outlet. Not ideal, but the fan has a very low amp draw.

We have a dehumidifier in the crawlspace (part of the encapsulation) and I was only concerned with evacuating the ammonia, so I set the fan to always run and it's been running...

United States on Jul 01, 2021

M. Dowdie: I was concerned by some reviewers that said the ventilator was too loud. I am very sensitive to noises, especially mechanical ones. The ventilator I received is not loud at all. It is audible in the crawlspace and for a few feet just outside the vent, but I wouldn't consider it loud even standing right next to it. I can't hear it inside the house, even standing directly over where it is mounted.

To be cautious about sound and vibration, I used some weatherstripping between the ventilator and the block wall where it is mounted and also used rubber washers on the screws. I now believe none of that was necessary and noise would not have been an issue even without those precautions.

I have no reason to doubt that the ventilator is moving its rated CFM of air, but it is certainly not producing a gale force wind. I haven't had it installed long enough to know if it will really impact the temperature or humidity level in my crawlspace.

Update:

I've now noticed that when the house is very quiet and I'm in the room directly above the ventilator, I can hear it faintly inside the house. Any water running or central heat/air running are much louder than the...

United States on Apr 12, 2012