46 CFR 144.415: Insulating heated surfaces near combustible material
Last reviewed: October 14, 2026
This section covers internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources near combustible material. They must have noncombustible insulation if less than 450 mm (18 inches) away from combustible material. Installations in accordance with ABYC P-1 or NFPA 302 are considered to meet the section.
What it says
Internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources must be insulated with noncombustible insulation if they are less than 450 mm (18 inches) away from combustible material.
“Internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources must be insulated with noncombustible insulation if less than 450 mm (18 inches) away from combustible material.”
Installations in accordance with ABYC P-1 or NFPA 302 will be considered as meeting the requirements of this section. The text refers to § 136.112 of this subchapter for the incorporation by reference.
“Installations in accordance with ABYC P-1 or NFPA 302 (incorporated by reference, see § 136.112 of this subchapter) will be considered as meeting the requirements of this section.”
Common questions
When must engine or galley exhaust ducts be insulated?
Internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources must be insulated with noncombustible insulation if they are less than 450 mm (18 inches) away from combustible material.
“Internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources must be insulated with noncombustible insulation if less than 450 mm (18 inches) away from combustible material.”
Does following ABYC P-1 or NFPA 302 satisfy this section?
Yes. Installations in accordance with ABYC P-1 or NFPA 302 will be considered as meeting the requirements of this section.
“Installations in accordance with ABYC P-1 or NFPA 302 (incorporated by reference, see § 136.112 of this subchapter) will be considered as meeting the requirements of this section.”
The text of 46 CFR 144.415
Electronic Code of Federal Regulations (eCFR), current as of April 16, 2026 · Read it on eCFR
Combustibles insulated from heated surfaces
Internal combustion engine exhaust ducts, galley exhaust ducts and similar ignition sources must be insulated with noncombustible insulation if less than 450 mm (18 inches) away from combustible material. Installations in accordance with ABYC P-1 or NFPA 302 (incorporated by reference, see § 136.112 of this subchapter) will be considered as meeting the requirements of this section.
Sections it refers to
The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of April 16, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.