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Home > Crawl Space Ventilation > UnderAire Deluxe One Fan Crawl Space Ventilator

UnderAire Deluxe One Fan Crawl Space Ventilator

UnderAire Deluxe One Fan Crawl Space Ventilator
UnderAire Deluxe One Fan Crawl Space VentilatorUnderAire Deluxe One Fan Crawl Space VentilatorUnderAire Deluxe One Fan Crawl Space VentilatorUnderAire Deluxe One Fan Crawl Space Ventilator
Item #TJE V1D
AvailabilityUsually ships in 1-2 weeks
Sale Price$165.00


UnderAire Deluxe One Fan Crawl Space Ventilator

Model V1D - Made in the USA!

UnderAire� Series Crawl Space Ventilators are designed to circulate fresh outdoor air underneath homes and porches. Excessive humidity levels in Crawl Spaces is the leading cause of premature rotting of support columns, joists, floors and beam supports. Humidity can promote fungus growth and increased termite activity in your crawl space. Humidity may also cause plumbing failures due to rust and corrosion. Constant operation helps vent radon gases, treated wood off-gassing and other odors that might migrate into living areas.

This crawl space ventilator is equipped with a factory installed and pre-wired thermostat which will prevent operation of the fan below 35F. Controlled by a dehumidistat which actuates the fan if the relative humidity rises above the selected set-point

The only line of crawl space ventilators with a special "suitable for damp locations" ETL listing. This model features one fan and large faceplate sized for ventilation openings through block foundations.  Includes thermostat, dehumidistat, and pre-wired 6 foot power cord. The ventilator is installed inside crawl space behind existing ventilation opening. Screws and masonry wall anchors are included with this crawl space ventilator.

  • Galvanized faceplate may be trimmed if necessary
  • One fan
  • Adjustable dehumidistat
  • Sealed bearing motors
  • Thermostat deactivates fan below 40F to avoid freeze-ups
  • Grounded 6' power cord


  • Capacity: 110 CFM
  • Motor: 115 Volts ~ 50/60 Hz 0.30 amps maximum
  • Thermostat: On at 50F Off at 35F
  • Dehumidistat: 20% - 80% RH Range
  • Dimensions: 18 x 9½ x 2
  • Warranty: One year

Download the Instruction Manual

Facts to know about Crawl Space Ventilation:
  • If soil is damp, as much as 20 gallons of water per 24 hours can evaporate into the air in a 1,400 sq. ft crawl space.
  • Primary causes of excess moisture include:
  • Surface runoff water
  • Poor ventilation
  • No or poor ground vapor barrier
  • Signs of excess moisture in crawl space:
  • Soil is wet
  • Surface organism growth on floor joists
  • Wet insulation
  • Musty odors in crawl space or living areas
  • Excessive moisture in living areas tending to migrate towards windows

From Mississippi State University Extension Service

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 two V1 or V1D crawl space ventilators or one V2D crawl space ventilator.

Made in the USA!

Question: Does this fan blow air into the space or pull air out?
Answer: The V1D Crawl Space Ventilator will draw the air out of the crawl space.
Question: How loud is this fan in sones?
Answer: The UnderAire Crawl Space Ventilator fan does not have a noise level rating but operates quietly.
Question: Whats the general setting range for the fan 50 to 60 or 60 to 70?
Answer: We recommend setting the dehumidistat at 50% to avoid mold and mildew.
Question: When adding fans to crawlspace vents do you close off remaining vents or leave these open?
Answer: You want to leave the vents open to bring in fresh air.
UnderAire Deluxe One Fan Crawl Space Ventilator

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