Crawl Space Ventilation
The optimal solution to the problems naturally inherent in crawl spaces, providing moisture control and air quality throughout.
The lack of ventilation, moisture intrusion, cold surfaces, combustion and the presence of pollutants, create an environment in the crawl space where the negative conditions work their way upwards and make your house unhealthy, uncomfortable and at risk from structural damage. There are observable indications of harmful conditions- odors (a gaseous byproduct of mold activity), mildew, condensation, and wood rot. The above are a clear indication of even more pollutants and problems that are undetected- the moisture that nurtures biological growth of mold, dust mites, termites and infestation. Pollutants and gases proliferate in crawl spaces (combustion, radon, etc.) and are absorbed in the moist air. The lack of ventilation will result in their infiltration into living areas. Stagnant moisture will saturate wood and concrete, causing floors to buckle, wood rot in beams and structural deterioration. This is a superior solution to foundation vents that tend to introduce moisture and mold spores aggravating the problem. Trying to seal the crawl space with barriers will not address indoor moisture accumulation from normal activities, nor will it expel the harmful air contaminants.
A professionally installed unit naturally transforms the problematic areas by maximizing expulsion, replenishment and circulation and then automatically maintains conditions.
A ventilation unit is installed to pull in the in the most problematic air at the floor level in the crawl space and expel out odors, moisture, pollutants, gases (combustion, radon, etc.), through a dedicated duct to the outside. A dehumidistat measures the relative humidity and will expel the air at 180 cfm when the readings are high (which does not exceed the rate of two bathrooms fans). When the relative humidity drops to the desired setting (50%-60%), the unit will drop to a maintenance mode of low rate of 40 cfm to control conditions.
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A booster fan installed in the floor above pulls down replenishment air into the crawl space. The relatively warmer, drier air from the upper level will raise temperature and lower relative humidity. A fresher healthier air supply from the upper level dramatically improves air quality. A unified dehumidistat control for both fans controls the ventilation rate to keep the air pressure in balance. There is extensive ducting to provide air circulation throughout, drying out the structure and preventing stagnation. A backdraft damper is included to prevent air in the crawl from reentering the living areas. Providing mechanical replenishment will assure that the replenishment air is not coming from the outside through vents or cracks.
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The exhaust ventilation together with the booster replenishment creates a strong combined airflow throughout the entire structure, extracting moisture and condensation. As the moisture is drawn off the surface by the airflow, the moisture absorbed in the walls, beams and floors comes to the surface and is then expelled. The unit creates an air circulation pattern in the entire house, providing a necessary healthy air exchange throughout the house 6-10 times a day; keeping structure dry, and reducing moisture problems. The continuous controlled ventilation will maintain moisture control, air quality and protect structural integrity.
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Product Specifications
Includes: Exhaust Ventilation, booster fan, backdraft damper, and ducting
Dimensions: 30” tall x 7” wide x 11” deep
Air Flow
High Mode: 180CFM (exhaust)
180CFM (recirculating)
Air Flow
Maintenance: 40CFM (exhaust)
40CFM (recirculating)
Power: 76 watts
Capacity: 3,000 sq. feet
Model Number: WV-CC
Warranty: 10 year parts warranty
