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DRAFT CONTROL
INSTALLATION OPTIONS
RECOMMENDED LOCATIONS FOR FIELD DRAFT CONTROLS
For gas-fired equipment, the preferred location of the control is
on the bull head tee. This location provides maximum relief of
downdrafts with minimum positive pressure.
(See Figure 1, Diagram A-C)
With oil or solid fuels, the bull head tee is not recommended,
so locate the control as shown. (See Figure 1, Diagram D-J)
These locations are acceptable for gas units as well. Except on
forced draft systems, locate the control as close as possible to the
furnace or boiler, at least 12" beyond a stack switch on oil-fired
units, and at least 18" from a combustible ceiling or wall.
FIGURE 1
MULTIPLE APPLIANCE LOCATION RECOMMENDATIONS
Commercial and industrial furnaces and boilers are frequently installed in multiples. (See Figure 2) Use a draft control for each
boiler located on the uptake between the smoke outlet and the breach (location A). When this uptake is too short to permit the
installation of a control, locate a separate control for each boiler on the main breach (location B). If neither of these locations
is possible, use a single large control in the breaching between the chimney and the nearest boiler (location C). Where several
units are vented into a common breaching, the most draft-critical should vent highest in, or be placed closest to the chimney.
Incinerators should generally be placed farthest from, or vented lowest in the chimney.
Figure 2
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