Buy Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220

Customer Ratings:
List Price: $206.29
Sale Price: $129.99
Today's Bonus: 37% Off

I too had high hopes that this device would "quietly" mitigate the humidity (RH) levels in our 2000 sq. ft. concrete-enclosed 42" crawl space.

Our Tjernlund V2D device is completely isolated from the wood floor joists (mounted directly & with rubber bushings, onto the top concrete foundation wall and up into the joist cavity, without touching any wood). Different foundation vent locations where tried but in each of them and in the quiet of the night we could definitely hear the run of the twin fans in our living areas upstairs, even under heavily insulated hardwood floors.

We've since _compromised_ on a vent location that is more remote from main living or bedroom areas.

To be clear, the V2D does seem to move along its rated amount of air, but at the expense of velocity noise (and frequency vibration if contacting any house structural components).

Another observation: the enclosed humidistat seems to sense the RH just at its mounted location -the foundation vent. This tends to skew the results for the rest of the crawl space. It has to be set way too high in order to match the digital hygrometer reading that is installed further into the crawl space area. To help solve that problem of always being 'on', my plan is to now separate the humidistat from the V2D unit and mount that component further into the crawl space as well.

At first I was impressed with the build quality and value of this unit. In fact, when first checking the device while being handheld it provided no clue (except it's attempt to levitate) as to any problems that would arise when actually mounted in application : it spun very solidly.

Perhaps the sting of the purchase could have been partially addressed by purchasing as separate fan and humidistat units ..and of course, thinking very hard about the amount of _quietness_ I was prepared to give up. And yes, it would have been quite helpful to have read more objective comments on this type of device before purchasing.

Click Here For Most Helpful Customer Reviews >>

Installed two of these in my crawl space. They work well, run fine, and are well made. Initially, I had some noise issues and determined it was the vibration from the fans running. Fairly easy to fix, just isolate from the frame of the house. I used some strips of foam and rubber-covered washers and that solved the noise problem.

Best Deals on Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220

i can't tell you how much i hesitated buying this fan after reading reviews that said the fan was loud. i hate appliance noises. lost sleep over it.

all for naught!

this thing is SUPER QUIET and the fans are of higher quality than i was expecting. I am super satisfied. i'll try to upload a video soon so you can hear how quiet it really is. at one point i almost had to look to see if the blades were spinning.

4/19 EDIT: there's no suggestion or guidance on where to set the humidistat. couldn't even find conclusive info online.

my totally non-scientific number seems to be at 70%. it's on when the rainy days and humid mornings come, but not on all the time. And this application is in the very humid DC area.

kill-a-watt says this guy is working at 35.5 watts.

Honest reviews on Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220

I purchased this for my crawl space a few weeks ago. We've had dampness issues and with all the Atlanta area flooding/rain, I figured it would be an asset. I'm sure it is doing some good with air movement but it's so darn loud despite having exchanged it once already and making sure to install it to manufacturer's specs. From the reviews I had read, I expected to not hear this at all. However, in my essentially ranch style home with a 3-4 foot tall crawl space, it's as loud or louder than my A/C. Even my wife who normally thinks I blow things out of proportion and am too sensative thought it was just too noisy, especially at night.

I'll probably move it to the a far corner of my home and set it for "biblical floods" only, the humidistat at 80 percent or higher. I'd give it one start but I'm sure it is moving air under the house, so it's probably doing 2 stars worth of good-but at a price.

Find helpful customer reviews and review ratings for Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220

I almost didn't buy this unit after one customer complained about it being noisy. I'm glad I pulled the trigger because this is a very good unit! The fans are "not" noisy and in fact I was impressed with how quiet they are. I can not hear the fans at all when in the house and standing directly over the unit located in the crawl space. I can hear them when I'm out side but need to be within about 10-15 feet of them. For this reason, I installed them in a location away from my patio and porches so it isn't an issue.

Before installing, I put weather strip on the inside of the metal all around the perimeter. I used 1/2" thick weather strip. This allowed the unit to easily mount against the cement block and wood sill board without any problems. The top two screws went into the wood sill and the bottom two screws went into the cement blocks. The weather strip provides a nice seal and prevents vibration transfer to the house.

A very good unit and works well. I can tell the fans are of high quality and the design is solid. Only suggestion would be to have the manufacturer include some rubber grommits in with the packaging for further isolation. Not necessary but might help some peoples install.