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14
Placement of Standby Generator to REDUCE THE
RISK OF FIRE
Requirements:
NFPA 37 2010, section 4. 1. 4, Engines Located Outdoors.
Engines, and their weatherproof housings if provided, that are
installed outdoors shall be located at least 1.5m (5 ft) from
openings in walls and at least 1.5 m (5 ft) from structures
having combustible walls. A minimum separation shall not be
required where either of the following conditions exist:
1. The adjacent wall of the structure has a fire resistance
rating of at least 1 hour.
2. The weatherproof enclosure is constructed
of noncombustible materials and it has been
demonstrated that a fire within the enclosure will not
ignite combustible materials outside the enclosure. *
Annex A Explanatory Material
A.4.1.4 (2) Means of demonstrating compliance are by
means of full-scale fire tests or by calculation procedures,
such as those given in NFPA 555, Guide on Methods for
Evaluating Potential for Room Flashover.
To comply with condition 2 above the weatherproof enclosure
has been constructed completely of non-combustible
materials and full-scale fire tests have been conducted to
demonstrate that a fire within the enclosure will not ignite
combustible materials outside the enclosure.
WARNING
Exhaust heat/gases could ignite combustibles
or structures resulting in death, serious injury and/
or property damage.
t Exhaust outlet side of weatherproof enclosure must have at least
5 ft. (1.5 m) minimum clearance from any structure, shrubs,
trees or any kind of vegetation.
t Standby generator weatherproof enclosure must be at least 5
ft. (1.5 m) from windows, doors, any wall opening, shrubs or
vegetation over 12 inches (30.5 cm) in height.
t Standby generator weatherproof enclosure must have a
minimum of 5 ft. (1.5 m) overhead clearance from any structure,
overhang or trees.
t DO NOT place weatherproof enclosure under a deck or other
type of structure that may confine airflow.
t Use only flexible fuel line provided. Connect provided fuel line to
generator, DO NOT use with or substitute any other flexible fuel
line.
t Smoke detector(s) MUST be installed and maintained indoors
according to the manufacturer’s instructions/recommendations.
Carbon monoxide alarms cannot detect smoke.
t DO NOT place weatherproof enclosure in manner other than
shown in illustrations.
Examples of standby generator locations to reduce the risk
of fire:
Vertical Clearances
Structure
Center of Exhaust Panel
Standby
Exhaust
Direction
5 ft
(1.5 m)
5 ft (1.5 m)
B
C
Legend for Generator Locations to reduce the risk of fire.
A Standby weatherproof enclosure must be at least 5
ft (1.5 m) from windows, doors, any wall opening,
shrubs or vegetation over 12 inches (30.5 cm) in
height.
B Exhaust outlet side of weatherproof enclosure must
have at least 5 ft (1.5 m) minimum clearance from
any structure, shrubs, trees or any kind of vegetation.
C Standby weatherproof enclosure must have a
minimum of 5 feet (1.5 m) overhead clearance from
any structure, overhang or trees.
NOTICE DO NOT place weatherproof enclosure under a deck
or other type of covered structure that may confine airflow.
B
C