DESCRIPTION
The Tjernlund UnderAire™ Series Fresh Air Supply Fans for Crawl Spaces are designed to boost fresh outdoor air under-
neath homes and porches. Use in conjunction with Tjernlund UnderAire™ Crawl Space Exhaust Fans to remove moisture in
Crawl Spaces with too few or undersized passive vent openings, overall lengths of over 40 feet, or in “dead zones” or stag-
nant areas that are not served by existing foundation vents.
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. Humidity may also cause plumbing
failures due to rust and corrosion. Helps dilute radon gases, treated wood off-gassing and other odors that might migrate
into living areas.
All models are equipped with a factory installed and pre-wired freeze protection thermostat which will prevent operation of
the fan below 35°F.
SPECIFICATIONS
SPECIFICA-
TIONS
GENERAL INFO
GENERAL INFORMATION
Each UnderAire™ Powered Fresh Air Supply Fan is electrically factory line tested before shipment.
After opening carton, inspect thoroughly for shipment damage. Fan should rotate freely and all electrical wires and connec-
tions should be secured. If any damage is found, notify freight carrier and your distributor immediately and file a concealed
damage claim.
RECOMMENDED APPLICATION
The CS1 & CS2 Powered Fresh Air Supply Fans are designed to be used in conjunction with Tjernlund V-Series exhaust
Crawl Space Ventilators (V1, V1D, V2D). Use without exhaust fans may limit the effectiveness of these fans and cause pos-
itive pressurization of the space which can could result in property damage. For optimal performance match CFM of supply
fan to CFM of exhaust fan. For example: (1) CS1 per V1 or V1D and (1) CS2 per V2D.
Powered Fresh Air Supply Fans for Crawl Spaces
©2011 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED
P/N: 8504176
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
READ OWNERS INSTRUCTIONS CAREFULLY PRIOR TO INSTALLATION.
THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT. DO NOT DESTROY.
MODEL CS1
MODEL CS1 Fresh Air Supply Fan:
Capacity:
110 CFM
Motor:
115 Volts ~ 50/60 Hz
0.30 amps maximum
Thermostat: On at 50°F
Off at 35°F
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest
Trimmable Dimensions: 7” x 6”
MODEL CS2 Fresh Air Supply:
Capacity:
220 CFM
Motors:
2 @ 115 Volts ~ 50/60 Hz
0.60 amps maximum
Thermostat: On at 50°F
Off at 35°F
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest
Trimmable Dimensions: 13” x 6”
MODEL CS2
