DESCRIPTION
The Tjernlund 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. 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. Deluxe models (V1D & V2D) are controlled by a dehumidistat which
actuates the fan if the relative humidity rises above the selected set-point.
IMPORTANT: All Ventilator models are equipped with a factory installed and pre-wired thermostat which will prevent operation of the fan below 35°F outdoor temperature. Normal operation of the fan will resume once the temperature outside rises
near 50° F.
SPECIFICATIONS
GENERAL INFORMATION
Each UnderAire™ Crawl Space Ventilator is electrically factory line tested before shipment.
After opening carton, inspect thoroughly for shipment damage. Fan should rotate freely and all electrical wires and connections should be secured. If any damage is found, notify freight carrier and your distributor immediately and file a concealed
damage claim.
RECOMMENDED VENTILATION RATE
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. divided by 15 minutes = 160 CFM of ventilation. Choose two V1 or V1D ventilators or one V2D
ventilator.
CRAWL SPACE VENTILATOR MODELS V1, V1D, V2D
©2013 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED P/N: 8504129 REV A
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 V1
MODEL V1D
MODEL V2D
MODEL V1 Ventilator:
Capacity: 110 CFM
Motor: 115 Volts ~ 50/60 Hz
0.30 amps maximum
Thermostat: On at 50°F
Off at 35°F
Dimensions: 14 3/8” x 6 7/8” x 2”
Mounting Plate Smallest
Trimmable Dimensions: 9 3/8” x 5 3/8”
MODEL V1D Ventilator:
Capacity: 110 CFM
Motor: 115 Volts ~ 50/60 Hz
0.30 amps maximum
Thermostat: On at 50°F
Off at 35°F
Dehumidistat: 20% - 80% RH Range
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest
Trimmable Dimensions: 9 3/4” x 6”
MODEL V2D Ventilator:
Capacity: 220 CFM
Motors: 2 @ 115 Volts ~ 50/60 Hz
0.60 amps maximum
Thermostat: On at 50°F
Off at 35°F
Dehumidistat: 20% - 80% RH Range
Dimensions: 18” x 9” x 2”
Mounting Plate Smallest
Trimmable Dimensions: 14” x 6”
INSTALLATION
The Crawl Space Ventilator must be installed by a qualified installer in accordance with these instructions and all local
codes or in their absence in accordance with the latest editions of the International Residential Code and International
Electrical Code. Improper installation can create a hazardous condition such as fire, electric shock or personal injury.
To reduce these risks significantly, use this unit only in the manner intended by the manufacturer. If you have questions,
contact Tjernlund Products. Always disconnect the Crawl Space Ventilator from its power source before installation and servicing.
CAUTION: For general ventilation use only. Do not use to exhaust hazardous or explosive materials and vapors.
WARNING: To reduce the risk of fire or electric shock, do not use this fan with any solid-state speed control device.
TOOLS REQUIRED
• 5/16" Nut Runner or Flat Head Screw Driver
• Drill with 5/16" Masonry Bit if mounting on brick or foundation block
• Grounded Electrical Outlet within 6 feet of Ventilator location (Models V1D & V2D). Model V1 must be hard wired.
INSTALLATION
LOCATION
Mount Crawl Space Ventilator inside the crawl space behind existing foundation ventilation openings. Ventilation openings
shall be within three feet of each corner of the building.
NOTE: Crawl Space Ventilator must be mounted with the electrical control box and motor facing the interior of the crawl space.
1. Remove existing doors or covers on ventilation openings around the perimeter of the building.
2. Position the Crawl Space Ventilator over the ventilation opening.
3. If installing on foundation block or brick, mark location in the four corners of the metal face plate and drill 5/16" holes with
masonry bit. Install wall anchors into openings and secure Crawl Space Ventilator to the wall with four screws.
If installing on a wood header, rim joist or mesh on existing crawl space vent, secure Crawl Space Ventilator with screws,
washers and nuts in the four corners of the Ventilator metal face plate.
TYPICAL MODEL V1D & V2D MOUNTING
(Model V2D Shown)
TYPICAL MODEL V1 MOUNTING
WARNING
!
MOUNTING PLATE TRIM DIMENSIONS
The following trim recommendations should be followed if the mounting plate needs to be modified to fit opening.
IMPORTANT: Use caution when trimming mounting plate so power cord is not damaged.
LEAVING ROOM FOR POWER CORD
1 1/4" MAX. TRIM
1 3/4" MAX. TRIM
V1D
9 3/4"
4" MAX.
TRIMTRIM
4 1/4" MAX.
6"
V2D
2" MAX.2" MAX.
14"
1 3/4" MAX. TRIM
1 1/4" MAX. TRIM
LEAVING ROOM FOR POWER CORD
6"
TRIMTRIM
3/4" MAX.
V1
9 3/8"
2 1/2" MAX.
TRIMTRIM
2 1/2" MAX.
5 3/8"
3/4" MAX.
TRIM
TRIM
MODEL V1
MODEL V1D
MODEL V2D
WHT
FAN
8050001
V1 ELECTRICAL BOX
BLK
L1
50/60 Hz
120 VAC
L2
PROVIDED BY INSTALLER
OPTIONAL SWITCH
GROUND
BLK
T-STAT
WIRING A SINGLE MODEL V1
V1 ELECTRICAL BOX
BLK
V1 ELECTRICAL BOX
BLKBLK
T-STAT
L2
50/60 Hz
120 VAC
L1
PROVIDED BY INSTALLER
OPTIONAL SWITCH
GROUND
WHT
T-STAT
BLK
WHT
FAN
FAN
8050002
WIRING MULTIPLE MODEL V1’s
WIRING
FREEZE PROTECTION THERMOSTAT ACTIVATION RANGE
IMPORTANT: All Ventilator models are equipped with a factory installed and pre-wired thermostat which will prevent opera-
tion of the fan below 35°F outdoor temperature. Normal operation of the fan will resume once the temperature outside rises
near 50° F. NOTE: Models V1D & V2D with dehumidistat control also will not operate if the freeze protection thermostat
senses low outdoor temperatures.
WARRANTY
TJERNLUND LIMITED ONE YEAR WARRANTY
Tjernlund Products, Inc. warrants to the original purchaser of this product that the product will be free from defects due to faulty material or workmanship for a period of (1)
year from the date of original purchase or delivery to the original purchaser, whichever is earlier. Remedies under this warranty are limited to repairing or replacing, at our
option, any product which shall, within the above stated warranty period, be returned to Tjernlund Products, Inc. at the address listed below, postage prepaid. THERE ARE
NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF, AND TJERNLUND PRODUCTS, INC. EXPRESSLY DISCLAIMS LIABILITY
FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF THIS PRODUCT. THIS WARRANTY IS IN LIEU OF ALL OTHER EXPRESS WARRANTIES AND NO AGENT IS AUTHORIZED TO ASSUME FOR US ANY LIABILITY ADDITIONAL TO THOSE SET FORTH IN THIS LIMITED WARRANTY. IMPLIED
WARRANTIES ARE LIMITED TO THE STATED DURATION OF THIS LIMITED WARRANTY. Some states do not allow limitation on how long an implied warranty lasts, so
that limitation may not apply to you. In addition, some states do not allow the exclusion or limitation of incidental or consequential damages, so that above limitation or
exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which may vary from State to State. Send all inquiries
regarding warranty work to Tjernlund Products, Inc. 1601 9th Street, White Bear Lake, MN 55110-6794. Phone (651) 426-2993 • (800) 255-4208 • Fax (651) 426-9547 •
Email fanmail@tjfans.com.
GROUND
L1
OFF
120 VAC
50/60 Hz
ON
DE-HUMIDISTAT
V1D ELECTRICAL BOX
REDBLK
T-STAT
WHT
BLU
FAN
8050003A
GRN
20 VAC
0/60 Hz
PROVIDED BY INSTALLER
OPTIONAL ON-OFF SWITCH-OUTLET
L2
MODEL V1D INTERNAL WIRING
120 VAC
50/60 Hz
OPTIONAL ON-OFF SWITCH-OUTLET
PROVIDED BY INSTALLER
GROUND
L1
L2
OFF
50/60 Hz
120 VAC
ON
FAN
FAN
V2D ELECTRICAL BOX
DE-HUMIDISTATT-STAT
BLK
RED
WHT
BLU
WHT
8050004A
BLK
GRN
MODEL V2D INTERNAL WIRING
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