Page 1
Insufficient combustion air causes:
Flue gas spillage, flame roll-outs, decreased
efficiencies, and reduced heating equipment life.
Conventional metal louvers
often are a major cause of
these problems:
Unregulated outdoor air supply
that changes with temperatures,
speed and direction of winds.
Architecturally unsightly large
outside wall openings that often
require structural reinforcement.
Mechanical room freeze ups in
northern climates.
Often not compatible with below grade or
interior mechanical rooms.
Tjernlund In-Forcer combustion air intakes
are packaged systems engineered to provide
controlled, interlocked combustion air.
Wall or roof opening size can be reduced by up
to 80% compared to conventional metal louvers.
In-Forcers include
matching, low profile
intake hoods that can
be mounted on either
a roof or sidewall.
Use small diameter
duct to deliver outdoor air up to 100 feet
away from intake hood.
Complies with Mechanical
Code requirements for combustion air supply.
Page 2
Use in virtually all mechanical
room locations
The IN-FORCER can be ducted up to 100 equivalent feet from the intake
hood. Even isolated mechanical rooms can easily be supplied with outdoor
combustion air. Cold outdoor air can be distributed through standard
ducts and diffusers at ceiling level, allowing the air to be tempered as it
drops to the floor, eliminating cold spots in the mechanical room.
Mechanical room noise transfer to the outside is further reduced since
there is no direct wall opening, typical of standard air intake louvers.
Variety of applications
■ Restaurant kitchens with negative pressure
caused by exhaust fans
■ Interior mechanical rooms with no direct
access to an outside wall
■ Conversions from electricto gas or oil
heating appliances
Duct air from roof
top for interior
mechanical rooms
Intake direct
thru outside
wall
Run horizontal
duct up to 100
feet
Compared to standard louvers, wall openings can be reduced by
up to 80%. This eliminates the need for extra support around
the opening that can cost far more in extra construction labor
and materials than the total installed cost of an IN-FORCER.
What’s more, IN-FORCER’S low profile hood blends into a
sidewall or roofline and is designed to keep wind and rain
out. Heavy duty 5052 aluminum construction will not corrode.
Small wall opening
lowers installation cost
■ Improves building’s
exterior appearance
The original and most
practical alternative
to metal louvers
BY TJERNLUND
Support beams are
typically required on
larger louvered intakes
IN-FORCER requires
maximum 12'' opening
and no extra support
sidewall mounted hood roof mounted hood
■ Confined space installations
■ Below grade mechanical rooms
■ Factories where processes cause backdrafting
of heating equipment
■ Laundries, dry cleaners, indoor pools, etc.
with chemically contaminated atmosphere
Page 3
UC1
with
MAC1E
or
MAC4E
Easy installation and
servicing
Millivolt Safety Interlock Kit
Model WHKE
For use with UC1 Universal Control,
MAC1E or MAC4E auxiliary controls.
The WHKE gas pressure switch
actuates the IN-FORCER through
the A – B dry contacts. The Linear
Limit switch disables the heater in
the event of a venting malfunction.
Includes JA1 thermocouple junction
adapter. To interlock millivolt water heater(s) only with
a UC1 controlled IN-FORCER add a WHKE for each
millivolt heater. To interlock a millivolt water heater
and one 24/115 VAC furnace or boiler with a UC1
controlled IN-FORCER, add a WHKE and a MAC1E.
Standard Safety
Features
IN-FORCER can be easily inter-
locked with multiple appliances.
Managed air distribution
assures comfort
Intake air from the IN-FORCER can be easily diffused
to eliminate concentrated cold air. Air can also be
heated with a hot water, steam or conventional unit
heater.
The IN-FORCER includes a high limit switch to
deactivate the system in the event of a mechanical
room fire and a pressure switch to detect blockage
or system malfunction.
Universal Control
Model UC1
The UC1 Universal Control is the
standardized interlock control for
Tjernlund Draft/Ventilation products.
The UC1 includes adjustable pre/post
purge and LED status/diagnostic
indicators. Provides easy interlock
with any 24/115 VAC burner control
circuit and also includes"dry"
contactactuation option.
Multiple Appliance Controls
Models MAC1E, MAC4E
Used in conjunction with the
UC1 Universal Control to interlock additional 24/115 VAC
burners. Powered by and
communicates with the UC1
through a factory wired whip. For one additional 24/115
VAC heater add the MAC1E. To interlock up to four or
more additional 24/115 VAC heaters, add the MAC4E.
MAC4Es can be daisy chained together for more than 5
heaters. Important: Total combined BTU/hr. input of all
heaters must be within IN-FORCER’s capacity.
Easy interlock options
with single or multiple
appliances
The IN-FORCER attaches with integral mounting
brackets or “eye” bolts. The inlet/outlet collars are
2 1/4 inches deep for easy duct connection. The
IN-FORCER features a blower that slides out for easy
servicing and a washable aluminum mesh pre-filter.
Page 4
MAX DUCT
LENGTH IN
EQUIV. FEET
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
98
MAX DUCT
LENGTH IN
EQUIV. FEET
100
100
100
100
100
100
100
100
98
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
RIGID DUCT
DIAMETER
IN INCHES
6
6
6
6
6
6
6
6
6
8
8
8
8
8
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
GAS
ATMOSPHERIC
GAS POWER BURNER
WITHOUT BAROMETRIC
GAS POWER BURNER
WITH BAROMETRIC
OIL FLAME RETENTION
WITH BAROMETRIC
RIGID DUCT
DIAMETER
IN INCHES
6
6
6
6
6
6
8
8
8
8
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
IN-FORCER MODEL APPLICATION CHART
Not Applicable
Not Applicable
MODEL
PAI-3
PAI-4
PAI-5 PAI-6
PAI-7
TJE R NLUN D P R O DU C TS, I N C.
1601 Ninth Street White Bear Lake, MN 55110-6794
Phone: 651.426.2993 800.255.4208 Fax: 651.426.9547
Visit our web site: www.tjernlund.com
Copyright © 2003 Tjernlund Products, Inc. All rights reserved P/N 8500402 Rev B 8/03
DISTRIBUTED BY:
DIMENSIONS (in inches)
A B C IN/OUT
PAI-3 12 9-1/2 20 6
PAI-4 12 9-1/2 20 8
PAI-5 13-3/4 15-1/4 24-1/4 10
PAI-6 13-3/4 15-1/4 24-1/4 10
PAI-7 16-5/8 18 32 12
UNIT SIZE
FRONT VIEW SIDE VIEW
Multiple IN-FORCERS may be installed for capacities larger than shown on chart.
Tjernlund UB-Series Universal Blowers are available for larger capacity applications.
MAX DUCT
LENGTH IN
EQUIV. FEET
100
100
100
100
100
100
100
100
100
100
100
100
100
95
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
RIGID DUCT
DIAMETER
IN INCHES
6
6
6
6
6
6
6
6
8
8
8
8
8
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
12
12
MAX DUCT
LENGTH IN
EQUIV. FEET
100
100
100
100
100
100
100
52
100
100
100
100
100
100
100
100
100
100
100
100
95
100
100
100
100
100
100
100
98
RIGID DUCT
DIAMETER
IN INCHES
6
6
6
8
8
8
8
10
10
10
10
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
BTU/HR
INPUT
150,000
200,000
250,000
275,000
300,000
350,000
400,000
450,000
500,000
550,000
600,000
650,000
700,000
775,000
850,000
900,000
950,000
1,000,000
1,100,000
1,200,000
1,300,000
1,400,000
1,500,000
1,600,000
1,700,000
1,800,000
1,900,000
2,000,000
2,100,000
2,200,000
2,300,000
2,400,000
2,500,000
2,600,000
2,700,000
2,800,000
2,900,000
3,000,000
3,100,000
3,200,000
3,300,000
3,400,000
3,500,000
3,600,000
3,700,000
PAI-3
PAI-4
PAI-5
PAI-6
PAI-7
A B C D
PAI-3 14 14 8-1/4 6
PAI-4 17-1/2 17-1/2 10-3/4 8
PAI-5 24-1/2 24-1/2 10-1/2 10
PAI-6 24-1/2 24-1/2 10-1/2 10
PAI-7 31 31 11 12
HOODS
DIA.
For automatic, variable speed combustion air or for larger capacity heating
systems use the UB-Series Universal
Blower and CPC-Series Constant
Pressure Controller.
UB-Series Blowers are rated for 575
o
F.
and are suitable for combustion air or
exhausting flue gas. Capacities up to
6,000 CFM.
UB-Series Fans Also Available
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