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

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Price: $124.50 $121.99   

Product Feature

• Deluxe two-fan ventilator
• Built-in dehumidistat
• Freeze protection thermostat
• Sealed bearing motors for long life
• Mounts into ventilation openings in block foundations

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. Volts: 110, Speeds (qty.): 1, Amps: 0.60, Power Cord (ft.): 6, Air Delivery (CFM): 220, Dimensions W x D x H (in.): 18 x 9 x 2

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

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.

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