Brochure

9
Draft Inducers
Chimney
Draft
Control
A
B
How Draft Inducers Work
1. Thermostat calls for heat.
2. The Inducer control is activated. This
energizes the Draft Inducer (A) which
creates negative pressure or draft.
3. The draft closes the negative pressure
proving switch and starts the burner (B).
4. When the thermostat is satisfied, both the
burner and Draft Inducer shut down.
Field Draft Inducers solve the drafting problems
caused by short chimneys, undersized flue pipes
and negative building pressures.
Draft Inducers are designed for easy installation
in a wide variety of applications, including oil or
gas-fired furnaces, water heaters, and boilers. For
venting single or multiple appliances, use a
control kit.
DI Paks are available for 24 volt and millivolt
applications and include all controls necessary.
When to use a Draft Inducer
• Long horizontal vent runs
• Undersized flue pipes
• Short chimneys
• Outside exposed chimney
Note: Pressure switch required according to NFPA code.
Not for sidewall venting.
Trees Above Chimney Outlet
Adjacent Tall Building
Insufficient Chimney Height Terrain Exposed Chimney
Sources of Draft Problems