Tjernlund Deluxe UnderAireT 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 UnderAireT 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.
East to install, very quiet motor, I would purchase this model with the dual fans. Great application for a crawlspace. Great for moving air and eliminating moisture. Fan has its own thermostat and humidistat. A must for a fan in the crawlspace. Fits easily over the ventilation grates. A nice long chord as well to plug into an outlet.
The installation in my crawl space was easy considering the unique challenges of my 60 year old house, because the mounting plate was nicely adaptable; the fans have been working well for several weeks nonstop without vibration or excessive noise; nice air flow and already a noticeable difference in air quality within the house (not so damp and musty smelling)...just wish that I had bought this product years ago!
The ventilator seems to be working fine. It was a breeze to install given that I already had an outlet available near the crawlspace vent.
With the humidistat set at 60%, it has yet to shut off in the nearly two weeks it has been installed. Not a surprise considering this is a house on the coastal plains of Alabama.
It seems to be making a difference in the musty smell of the crawlspace. It will take me a full year of observation before I can really recommend or not recommend this product.
I purchased one then ordered a second after installing the first. I can hardly hear it running from inside the house. Go for the double fan unit for the extra air movement. Installation could not have been easier. Don't drill anchor holes in mortar joints or they will waller out and the anchors will not hold. I threw away the plastic anchors and used lead anchors. Much better holding power.
