Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220 CFM, Model# V2D

by Tjernlund

Product Description

Fan-powered ventilator quickly reduces moisture in crawl spaces to protect home and occupants. Increases air circulation to prevent condensation, mold, mildew and wood rot. Also helps vent radon gas, treated wood gases and odors, preventing them from migrating into living areas. U.S.A. Air Delivery (CFM): 220, Speeds (qty.): 1, Amps: 0.60, Volts: 110, Power Cord (ft.): 6, Dimensions W x D x H (in.): 18 x 9 x 2

Product Details

• Product Dimensions: 20 x 11 x 4 inches ; 7 pounds
• Shipping Weight: 7 pounds (View shipping rates and policies)
• ASIN: B000N4WOWK
• Average Customer Review: 4.5 out of 5 stars  See all reviews (24 customer reviews)
• Amazon Best Sellers Rank: #6,840 in Home Improvement (See Top 100 in Home Improvement)
  • #72 in Home & Kitchen > Heating, Cooling & Air Quality > Fans

Customer Reviews

Most Helpful Customer Reviews

14 of 15 people found the following review helpful:

2.0 out of 5 stars Wanted it to work out... but just too noisy., November 9, 2009

By 

D. Wood "ATL" (Atlanta, GA) - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220 CFM, Model# V2D (Misc.)

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.

9 of 9 people found the following review helpful:

3.0 out of 5 stars Be careful where you mount this beast !, December 26, 2010

By 

Wayne - See all my reviews

This review is from: Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220 CFM, Model# V2D (Misc.)

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.

5 of 5 people found the following review helpful:

5.0 out of 5 stars Good Product, October 3, 2010

By 

PenName - See all my reviews

This review is from: Tjernlund UnderAire Crawl Space Ventilator - Deluxe Two-Fan, 220 CFM, Model# V2D (Misc.)

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.