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Chimney Dampers / Tjernlund Crawlspace Fans
Please choose one of products below...

$83.75 - Tjernlund V1 Crawlspace Fan. Shipping Included.
$107.50 - Tjernlund V1D Crawlspace Fan. Shipping Included.
$149.75 - Tjernlund V2D Crawlspace Fan. Shipping Included.
$38.00 - DH10 Dehumidistat control. COMBO Special..
$45.00 - DH10 Dehumidistat control. Shipping Included.

Ventilates 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 listing.

 
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 DH10 dehumidistat. Includes freeze protection thermostat.
V1  110 CFM V1, V1D, V2D Instructions


One fan and large faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat, dehumidistat and pre-wired 6’ power cord.
 
V1D  110 CFM V1, V1D, V2D Instructions

Two fans and large faceplate sized for ventilation openings through block foundations. Includes freeze protection thermostat, dehumidistat and pre-wired 6’ power cord.
V2D  220 CFM V1, V1D, V2D Instructions

Dehumidistat for V1crawl space ventilator.  Adjustable up to 80 percent humidity.  Control multiple V1's with one control.
DH10 Control DH10 Instructions

SPECIFICATIONS

How to determine the number of UnderAireVentilators 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.

Pricing is based on 3 options of fan(s) with control for the example above...
If a crawlspace requires 160 CFM's you could use...

Option 1: 2 pc V1D's  providing 220 CFM's combined @ $107.50 ea.  Total $215 delivered.
Option 2: 1 pc V2D  providing 220 CFM's @ $149.75.  Total $149.75 delivered.
Option 3: 2 pc V1's  providing 220 CFM's combined @ $83.75 ea. plus (1) DH10 dehumidistat control @ $38.  Total $205.50 delivered.

Provide crawlspace measurements and/or sketch for a proper quote.
Usually ships UPS Ground.  Additional shipping charges to AK, HI & Canada .   No tax out of NY.