Brochure
Page 2
OPERATION 
When the boiler receives a call for heat, the damper rotates to the open position before the burner circuit is energized. If the 
damper does not rotate to the open position, the burner circuit will not be energized. When properly installed, the electrical circuits 
in this product are designed not to override the existing limit and safety controls of the appliance. 
WARNING: Before installing the vent damper: 
1.  Read this manual carefully and completely. 
2.  Be sure to follow all procedures and safety inspections. 
3.  Do not negate the action of any safety or operational controls. 
4.  The vent damper is not for retrofit in Canada. 
TO THE USER
For continued safe operation the appliance device combination should be inspected annually by a qualified service agency. It is 
recommended that the homeowner should have the vent system and the damper device examined annually for deterioration from 
corrosion or other sources. This inspection should be performed prior to and during each heating season. 
GENERAL INFORMATION
D
IMENSIONAL DATA 
E
LECTRICAL DATA 
F
EATURES 
1.  Service Switch – Holds damper open and allows the appliance to operate without the damper operating. 
2.  18 month limited warranty on motorized assembly from date of manufacturing . 
3.  Two internal safety switches 
4.  Power open, power close – extends product life. Reduced electrical consumption 
5.  24 VAC for simple and low-cost wiring. Plug in harness available. 
6.  Flex Seal provides self cleaning action. 
7.  Stainless steel pipe assembly. 
Minimum Wiring Requirements  24 VAC, 18 Gauge, 105C 
Thermostat Heat Anticipation 
Add an additional 0.1 Amp to the specified 
or measured control circuit amps 
Power Draw Requirement  3W at 24 VAC when opening or closing 
Timing 
15 sec, Power open 
15 sec, Power close 
Figure 1
Dim ‘A’ 
Tube Size
(Inches) 
Dim ‘B’ 
Length 
(Inches)
Dim ‘C’ 
Total Height
(Inches) 
Dim ‘D’ 
(Inches) 
Dim ‘E’ 
(Inches)
Weight
(lbs.) 
4 6 9-5/8 15/16 5 2.50 
5 6 10-5/8 15/16 5 2.70 
6 6-1/2 11-5/8 1-1/8 5-1/2 3.10 
7 7-1/16 12-5/8 1-3/8 6-1/16 3.55 
8 8-1/16 13-5/8 1-7/8 7-1/16 4.40 
9 10-1/8 14-5/8 2-7/8 9-1/8 6.27 
10 12-1/8 15-5/8 3-7/8 11-1/8 6.95 
12 12-1/8 17-5/8 3-7/8 11-1/8 8.75 










