Generator placement and dimensions

Placement diagram – air-cooled generators

Generator placement diagrams including overhead clearances, house elevation with roof heights, 3D perspective, and generator front and side views with millimeter and inch dimensions.
Generator placement clearance requirements
ID Description Comments
A Top of generator None
B Front and end clearance Minimum clear distances cannot include shrubs, bushes, or trees.
C Rear clearance 18 in (45.7 cm) minimum clearance per NFPA testing, labeling, and listing, unless state or local codes dictate otherwise.
D Windows and openings No operable windows, doors, or openings in the wall are permitted within 5 ft (1.52 m) from any point of the generator.
E Existing wall One-hour fire rated walls allow closer placement of the generator set without approved enclosure. Confirm before installation.
F Removable fence Removable fence panels for servicing cannot be placed less than 3 ft (0.91 m) in front of the generator.
G Overhead clearance 5 ft (1.52 m) minimum distance from any structure, overhang, or projections from the wall. DO NOT install under wooden decks or structures unless this distance is maintained.