Tjernlund Deluxe UnderAire™ 220 CFM Crawlspace Ventilation Fan. Two fans and large faceplate sized for ventilation openings through block foundations. Includes thermostat, dehumidistat and pre-wired 6’ power cord.
Fan powered crawl space ventilation quickly reduces moisture helping to protect both home and occupants.
FEATURES and BENFITS: * Ventilates excess moisture, the cause of mold, mildew and wood rot. Increases air circulation to fight condensation. * Constant operation helps vent radon, treated wood offgassing and odors that might otherwise migrate into living areas. * Galvanized face plate may be trimmed if necessary * Includes adjustable dehumidistat with automatic low temp shut off & restart switch (40 F off, 50 F to turn back on) to avoid freeze up * Includes mounting hardware and installation / owners manual
SPECIFICATIONS: Performance: 220 CFM Dehumidistat: Off/On or 20% - 80% RH Thermostat: Opens at 40 degrees F Dimensions: 18” x 9” x 2” .62 Amps Maximum
How to determine the number of UnderAire™ Ventilators needed: Calculate the cubic area of the crawl space by multiplying the length x width x height. Divide this number by 15 to determine the minimum CFM necessary to fully ventilate the space in 15 minutes. Example: 20' wide x 40' long x 3' high crawl space = 2,400 cubic ft. 2400 cubic ft. ÷ 15 minutes = 160 CFM of ventilation. Choose one V2D ventilator.
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Comments:
Container Ventilation
By Dave Olson from East Central Illinois on 12/9/2009
We needed to move air in a storage container that I store an antique truck.
We had to mount it in the upper part of the container or the tires of the truck would hit the fan when we drove the truck in or out.
I also wanted the fan in the front of the container because the truck is so big we cannot get past it and wanted to be able to access the fan without moving the truck.
We cut holes in the side of the container and installed a grill over it. We installed a like grill on the other end so the air will travel the length of the space.
Container is 48 feet long, 9 feet tall and 8-1/2 feet wide.
Kind of early to tell if this is going to get the job done since colder weather has set it, but I sure hope this solves the problem of the truck sweating!
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A product that does what it says it will
By CO Homeowner from Westminster, CO on 10/12/2009
I am using this product to vent a ~1800 cubic foot crawlspace. I had a terrible smell down there and within two days the fan eliminated the smell. It might have gone faster if it were not a sealed space with just the one vent where the fan is. The fan is a bit noisy because it is attached to the frame, it's not too loud but you can hear it on the side of the house the fan is attached to even on the second floor. The humidistat works great and I have had to set it at ~20% to keep it running constantly. We recently had 17 degree F night temps but the temp control did not turn off the fan, most likely due to the crawl space being warmer as none of the pipes froze. This product does what it says it will do. As for durability I can not comment on that as I have only had it 2 months. I would recomend it to anyone wanting to freshen the dead air space of a sealed crawl space.
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Put two of these in a very humid crawl space. Humidity had to be 100%. Some of the joists were saturated and mold was present. Used 6 mil poly for the vapor barrier and added two of these at opposite ends. After 3 weeks all the wooden members were dried and humidity was much lower. The mold was dried and flaking off. The only caveat is the humidity control doesn't seem very sensitive. ..perhaps it take a lot of time to adjust.
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[1 of 1 customers found this review helpful]
Just what I needed for a damp crawl
By Bobert the Robert from Waukegan, IL on 9/14/2009
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The product performs well and was very easy to install. As anticipated, the original 2 units were not large enough for the volume of air I need to more. I ordered 2 more. So far very good. Time will tell if they do the job I need.
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