Product Manual

ROOFTOP INDUCER SELECTION TABLES
2
0
0 200 400 600 800 1000
CFM (STD. AIR 70 DEGREES F)
STATIC PRESSURE (INCHES W.C.)
0
RT12 SERIES
1000800600400200
0.4
0.3
0.2
0.1 0.1
0.2
0.3
0.4
8069016
1200 1400 1600 1800
0
0.8
0.7
0.6
0.5
1800160014001200
0.5
0.6
0.7
0.8
1.0
0.9 0.9
1.0
(120 VAC)
MINIMUM SPEED
WITH TJERNLUND
SPEED CONTROL
MODELS RT1500 & RT1500H
OPERATING
RANGE
MAXIMUM SPEED
WITH TJERNLUND
SPEED CONTROL
1.1 1.1
RT8 SERIES
MODELS RT750 & RT750H
OPERATING
RANGE
(120 VAC)
MAXIMUM SPEED
MINIMUM SPEED
WITH TJERNLUND
SPEED CONTROL
WITH TJERNLUND
SPEED CONTROL
0
0 100 200 300 400 500
CFM (STD. AIR 70 DEGREES F)
STATIC PRESSURE (INCHES W.C.)
0
500400300200100
0.4
0.3
0.2
0.1 0.1
0.2
0.3
0.4
8069015
600 700 800 900
0
0.8
0.7
0.6
0.5
900800700600
0.5
0.6
0.7
0.8
1.0
0.9 0.9
1.0
MODELS RT750 & RT750H MODELS RT1500 & RT1500H
*IMPORTANT: Select the inducer based on the BTU/hr input of the appliance(s) rather than
the diameter of the appliance(s) vent outlet or chimney. Vent/Chimney sizes listed are the
smallest inside diameter recommended for the associated BTU/hr input. Use a tapered reduc-
ing collar or transition fitting if the vent is reduced to the pipe diameter listed in selection table.
To determine equivalent feet, add the total length of straight vent pipe plus 10 feet for each 90
degree elbow and 5 feet for each 45 degree elbow.
ROOFTOP INDUCER FAN CURVES
Models RT750 & RT1500 Selection
Table for Gas & Oil Applications
Models RT750H & RT1500H
Selection for Solid Fuel Fireplaces
Efficient draft that moves smoke up the chimney and
keeps it from entering the living area is dependent on
maintaining a negative pressure capture velocity at the
hearth opening. Even if glass fireplace doors are present,
reducing the open area, a negative pressure capture
velocity must be calculated based on the entire hearth
opening since the doors need to be opened to add addi-
tional logs.
Multiply the vertical and horizontal hearth opening to
determine the face area opening in square feet. If the
fireplace is open on the sides or back total all openings
to arrive at the total face area.
If typically the fire can be maintained but smoke drifts into
the room, select the model which has a face area capaci-
ty equal or greater than the face opening.
Maximum Face Area:
RT750H 14 Ft²
RT1500H 28 Ft²
Tjernlund offers free design recommendations for unusu-
al fireplace designs, such as free-standing and custom
gas fireplaces. If in doubt, consult factory.