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Site Selection and Preparation
Potential CO Entry Points
See
Figure
3-1. Generator exhaust can enter a structure
through large openings, such as windows and doors.
However, exhaust and CO can also seep into the struc-
ture through smaller, less obvious openings.
C
B
A
A
ID
Entry Point
A
Windows and doors
B
Garage door
C
Attic vent
D
Basement windows
Furnace intake /
E
exhaust vent
F
Wall cracks
G
Dryer vent
H
Airflow restrictions
J
Make up air system
10
F
A
Figure 3-1. Carbon Monoxide—Potential Entry Points
Architectural details which can be (or are) opened to admit fresh air into the structure.
CO can leak into garage if door is open, or does not seal correctly when closed.
Attic vents, ridge vents, crawl space vents, and soffit vents can all admit generator exhaust.
Windows or hatches allowing ventilation to or from lower level of a structure.
Air intake and exhaust pipes for furnace.
Includes (but not limited to) cracks in wall, foundation, mortar, or air gaps around doors,
windows, and pipes. See
Protect the
Exhaust duct for clothes dryer.
Structural corners and locations with heavy vegetation restrict airflow. Exhaust gases can collect
in such areas.
IMPORTANT NOTE: Mechanical and gravity outdoor air intake openings for HVAC supply
air systems shall be located not less than 10 feet (3048mm) horizontally from the
generator enclosure. See Section 401 in the ICC Mechanical Code for any additional
requirements.
Protect the Structure
Verify structure itself is correctly caulked and sealed to
prevent air from leaking in or out. Voids, cracks, or open-
ings around windows, doors, soffits, pipes, and vents can
allow exhaust gas to be drawn into the structure.
Some examples of potential entry points are described
and included in, but not limited to, the accompanying
table.
A
A
H
D
E
A
Description / Comments
Structure.
Installation Guidelines For Spark-Ignited Stationary Generators
K
C
A
J
G
010044
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