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UnderAire Crawl Space Ventilators
Tjernlund UnderAire™ crawl space fans ventilate excess moisture -- a cause of mold, mildew and wood rot. Increases air circulation to fight condensation. Constant operation helps vent radon, treated wood off-gassing and odors that might otherwise migrate into living areas. The only crawl space ventilators with a special "suitable for damp locations" ETL Safety Listing. Galvanized faceplate can be cut to fit openings smaller than 18" x 9".

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 ventilators or one V2D ventilator.

V2D
(220 CFM)
$189.95
V1D
(110 CFM)
$149.95
V1
(110 CFM)
$119.95
Two fans and large faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat, dehumidistat and pre-wired 6’ power cord. One fan and large faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat, dehumidistat and pre-wired 6’ power cord. One fan and small faceplate for ventilation openings through brick foundations. (Requires switch or dehumidistat to activate. Multiple ventilators may be controlled by a single switch or dehumidistat). Includes freeze protection thermostat.

 

Click to Watch

V1, V1D, V2D Literature  |    V1, V1D, V2D Instructions


UnderAire™ Fresh Air Supply Fans for Crawl Spaces
Use in conjunction with Tjernlund Crawl Space Ventilators to maximize the removal moisture in Crawl Spaces with:
  • Too few passive vent openings
  • Undersized passive vent openings
  • Passive vent openings located 40’ or more from Crawl Space Ventilators
  • “Dead Spots” that are not served by existing foundation vents (typically corners and annexes of L-shaped or other non-rectangular crawl spaces)

Installs on inside or outside of crawl space opening or against a joist near “Dead Spots.” Air flow (CFM) of Fresh Air Supply Fans can be matched with air flow of Crawl Space Fans. Heavy duty galvanized steel construction. Paintable.

Add our DH2P Dehumidistat Control to have the Supply Fans turn on/off as needed based on the crawl space humidity level (see bottom of page).



CS1
(110 CFM)
One fan and 10”x18” faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat, hardware packet, and pre-wired 6’ power cord.
  $129.95



CS2
(220 CFM)
Two fans and 10”x18” faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat for each fan, hardware packet, and pre-wired 6’ power cord.
 
  $169.95
CS1, CS2 Instructions

CS1 Outside View  CS2 Outside View   Freeze Protection Thermostat 
     


UnderAire™ Crawl Space Vents
The UnderAire™ crawl space vents can be used to provide foundations with passive ventilation or can be used along with a fan-powered crawl space ventilator for maximum effectiveness. Crawl space vents can be used to provide foundations with passive ventilation or can be used along with a fan-powered crawl space ventilator for maximum effectiveness.

These premium crawl space vents come in two decorative patterns, both with the following features:
 

  • Sturdy Galvanized Steel Construction Increases Product Durability and Lifespan
     
  • Install from Outside or Inside of Crawl Space
     
  • 18" x 10" to Cover Block Foundation Wall Openings
     
  • Professional Modern Decorative Designs
     
  • Matches Models V1, V1D, V2D Crawl Space Ventilators
     
  • Easy 5-Minute Installation
     
  • Paintable (Steel Primer Recommended)
     
  • Mounting Hardware Included
     
  • Factory Approved Accessory for UnderAire™ Crawl Space Fans

Close-up of "Morning Star" Pattern
 18x10 M.S. Vent
$19.95


Close-up of "Steel Diamond" Pattern
 18x10 S.D. Vent
$19.95

UnderAire™ Crawl Space Vent Instructions



DH10
Dehumidistat for Crawl Space Ventilator V1.  Adjustable from 20 to 80 percent humidity and on/off. Hardwired.
 
 DH10 Instructions  $69.95  
                   

DH2P
Dehumidistat for Fresh Air Supply Fans. Adjustable from 20 to 80 percent humidity and on/off. Two electrical outlets for multiple units and pre-installed 6' power cord.
 
DH2P Instructions $99.95


 


 
Copyright 2012 Tjernlund Products, Inc.