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34
Concentric Venting Through an Existing System
1
Figure 21 - 1, 2 - Concentric Venting Through an Existing System, 3, Chase Venting Through an Existing System
NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required by
local codes.
3. Power Venting, Indoor Combustion Air in Confined or Unconfined Space
This boiler requires fresh, uncontaminated air for safe
operation and must be installed in a mechanical room where
there is adequate combustion and ventilating air. NOTE: To
prevent combustion air contamination, see Table 2.
Combustion air from the indoor space can be used if the space
has adequate area or when air is provided through a duct or
louver to supply sufficient combustion air based on the boiler
input. Never obstruct the supply of combustion air to the
boiler. If the boiler is installed in areas where indoor air is
contaminated (see Figure 22) it is imperative that the boiler
be installed as direct vent so that all combustion air is taken
directly from the outdoors into the boiler intake connection.
Unconfined space is space with volume greater than 50 cubic
feet per 1,000 Btu/hour (4.8 cubic meters per kW) of the
total input rating of all fuel-burning appliances installed in
that space. Rooms connected directly to this space, through
openings not furnished with doors, are considered part of the
space.
Confined space is space with volume less than 50 cubic feet
per 1,000 Btu/hour (4.8 cubic meters per kW) of the total input
rating of all fuel-burning appliances installed in that space.
Rooms connected directly to this space, through openings not
furnished with doors, are considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a confined space, such space should
be provided with two permanent openings: one located 6"
(15 cm) below the space ceiling, the other 6" (15cm) above
the space floor. Each opening should have a free area of one
square inch per 1,000 Btu/hr (22cm2/kW) of the total input of
all appliances in the space, but not less than 100 square inches
(645cm2).
If the confined space is within a building of tight construction,
air for combustion must be obtained from the outdoors as
outlined in the Venting section of this manual. See Figure 23.
WHL-016 Rev. 4.14.16
Concentric Venting Through an Existing System
2
AIR INTAKE
W/ SCREEN
Chase Venting Through an Existing System
3
EXISTING
VENT
AIR INTAKE
W/ SCREEN
DO NOT PLACE
DRYER NEAR
WATER HEATER
OR BOILER
Figure 22 - Do Not Place Appliance Near Dryer
INTAKE
LP-325-X
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