Canadian building code question

What are the building code requirements for kitchen exhaust systems in Canada?

Commercial kitchen exhaust systems in Canada must comply with NBC requirements and NFPA 96, including Type I or Type II hood classification, grease duct construction, fire suppression systems, clearances, and makeup air provisions.

Commercial kitchen exhaust systems are regulated to prevent grease fires, ensure adequate ventilation, and protect building occupants. The National Building Code references NFPA 96 (Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations) and sets requirements for hood types, duct materials, fire suppression, and the interaction between exhaust and building fire-protection systems.

What to check first

  • Type I hoods (grease-producing equipment) require grease-rated ductwork, fire suppression, and specific clearances from combustible construction.
  • Type II hoods (non-grease equipment like ovens and dishwashers) have simpler duct and fire-protection requirements.
  • Makeup air must be provided to replace exhausted air without creating negative pressure that affects fire-protection or comfort systems.

Jurisdiction notes

National baseline

NBC Part 3 and Part 6 address kitchen exhaust requirements, referencing NFPA 96 for commercial cooking operations. Part 9 covers smaller residential cooking exhaust.

Provincial variations

Provinces may reference specific editions of NFPA 96 or have additional requirements for exhaust termination, rooftop clearances, and fire suppression system types.

Local fire department

Many municipalities require fire department review and approval of commercial kitchen exhaust and fire suppression systems as part of the building permit process.

Work through it in this order

  1. Classify the cooking equipment to determine whether a Type I or Type II hood is required.
  2. Design the exhaust duct system with appropriate materials, construction, and clearances per NFPA 96 and the applicable code.
  3. Determine the fire suppression system requirements for Type I hoods, including automatic and manual activation.
  4. Calculate makeup air requirements and verify that the system does not create negative pressure affecting other building systems.
  5. Confirm exhaust termination location, clearances from openings and property lines, and rooftop equipment requirements.

Common questions

When is a Type I kitchen hood required?

A Type I hood is required over cooking equipment that produces grease-laden vapors, including fryers, grills, griddles, and charbroilers. The classification is based on the equipment type, not the food.

Is a fire suppression system always required in a commercial kitchen?

A fire suppression system is required for Type I hood installations. Type II hoods serving non-grease equipment typically do not require a dedicated fire suppression system.

Can a commercial kitchen exhaust duct pass through a fire separation?

Yes, but the duct penetration must be protected with a fire damper or shaft enclosure as required by the code, and the duct material and construction must meet NFPA 96 requirements for grease ducts.