Welding & Duct Repair

We provide professional welding and structural repairs for commercial kitchen exhaust duct systems in accordance with NFPA 96’ and applicable Ontario fire code requirements.

Grease duct systems are required to be continuously welded and liquid-tight. Over time, seams, joints, and penetrations may develop leaks due to vibration, corrosion, or previous improper modifications. When identified, these areas can be properly repaired to restore system integrity and compliance.

Cleaning Prior to Welding

Before any welding or hot work is performed on grease duct systems, the affected duct section must be cleaned.

Relevant standards include:

NFPA 96’ – Section 4.1.5
Exhaust systems shall be maintained to prevent grease accumulation.
NFPA 96’ – Sections 7.1.1 & 7.1.2
Grease ducts shall be constructed as liquid-tight, continuously welded systems.
NFPA 96’ – Section 11.4.1
Grease accumulation shall be removed when it exceeds 0.078 in (2 mm).
NFPA 96’ – Section 7.4.4
Access panels shall be grease-tight and constructed of materials equivalent to the duct.
NFPA 51B – Standard for Fire Prevention During Welding, Cutting, and Other Hot Work – Section 7.4.5
Combustible residues shall be removed prior to performing hot work.

Our Repair Standard

We Clean affected duct sections prior to welding

We Perform professional welded repairs to restore liquid-tight integrity

We Maintain required access points and fire-resistance ratings where applicable

We Document repairs as part of the service record

All work is completed in a professional, compliance-focused manner consistent with NFPA 96’ and Ontario fire code requirements.

Welding & Duct Repair