DESCRIPTION & PURPOSE
The EF-AUTO Series Duct Booster® fans are designed to increase the flow of heated air in warm air heating systems or cooled air in
central air conditioning systems. The EF-AUTO Series include a 115 VAC power cord and built-in Pressure Response Control so they
can be automatically operated when the forced air system fan/blower is running.
SEQUENCE OF OPERATION
The EF-AUTO Series are controlled by an electronic Pressure Response Control (PRC). The PRC control senses positive pressure in
the duct work and turns the EF-AUTO Fan on when the forced air system fan/blower is running. The EF-AUTO fan will continue to run
after the forced air system fan/blower shuts off to continue to distribute warm or cool air to the room. NOTE: The PRC may momentarily
shut the EF-AUTO unit off while the forced air system fan/blower is running while it does a pressure check to determine if the EF-AUTO
should continue to run.
MOTOR SPECIFICATIONS & PERFORMANCE
1. Table is based on straight metal duct. 90 degree elbows are equivalent to 10 feet of straight duct. 45 degree elbows are equivalent
to 5 feet of straight duct. Performance is based on 70
o
F. standard air.
2. The number after the EF-matches the round duct diameter. Example: The EF-6AUTO connects to 6” round duct.
3. For complete dimensions and performance specifications visit www.tjernlund.com.
INSTALLATION
The EF-AUTO fans are usually used in branch ducts, not the main supply or “trunk line” duct. All models can be easily mounted in sheet
metal or flexible duct. DO NOT install the EF-AUTO Series fans where the temperature of air within the duct exceeds 150 degrees F.
This temperature would rarely be found on a forced air system. Locating the fan near the end of the duct will provide the most efficient
performance.
IMPORTANT:
For proper operation of the PRC sensing control, do not install the EF-AUTO within 10 duct diameters from outlet end
supply register. For example, if the duct is 6”, 6 x 10 = 60” from outlet supply register.
FLEXIBLE DUCT (Diagram A)
Choose a seam or other point in the duct where the EF-Series fan will be mounted.
IMPORTANT:
For proper operation of the PRC control do not install the EF-AUTO
within 10 duct diameters from outlet end supply register. For example if the duct is 6”,
6 x 10 = 60” from outlet supply register. Cut or separate the flexible duct and install
the fan with fan blade facing the direction of air flow, (See Diagram A). Seal both
sides with duct tape and/or a flexible duct clamp. Support with plumber’s strap or
other suitable method if necessary.
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 OWNER’S INSTRUCTIONS CARE-
FULLY PRIOR TO INSTALLATION.
THESE INSTRUCTIONS MUST REMAIN
WITH EQUIPMENT. DO NOT DESTROY.
AUTOMATIC
DUCT BOOSTER® MODELS
EF-6AUTO & EF-8AUTO
©2008 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED
P/N: 8504157
EF-6 AUTO
120V
30 Watt
0.4A
150 CFM
100 CFM
90 CFM
180 CFM
120V
EF-8 AUTO
56 Watt
1.1A
300 CFM
250 CFM
325 CFM
200 CFM
MOTOR
SPECIFICATIONS
MODEL
DUCT LENGTH AND AIR FLOW (Cubic Ft / Minute)
0 FEET
25 FEET
50 FEET
75 FEET
AIR FLOW
8050017 10/20/08
DIAGRAM A
