What are the ventilation requirements for a kitchen range hood in New Brunswick?

Kitchen range hoods in New Brunswick must comply with the National Building Code of Canada 2020 edition, which became effective May 1, 2025 for new applications. The code requires mechanical ventilation for all cooking appliances, with specific airflow rates based on your cooking surface type and size.

For residential gas cooktops, you need a minimum of 100 cubic feet per minute (CFM) per linear foot of cooking surface. A standard 30-inch gas range requires at least 250 CFM, though most contractors recommend 300-400 CFM for better performance. Electric cooktops have slightly lower requirements at 40 CFM per linear foot, so that same 30-inch electric range needs minimum 100 CFM, though 200-250 CFM provides better results.

Professional-style ranges over 40,000 BTU/hour trigger higher ventilation requirements and may need makeup air systems to prevent backdrafting of other appliances. This is particularly important in New Brunswick's well-sealed homes where negative pressure can pull combustion gases back down chimneys or flues.

The range hood must exhaust directly to the exterior - never into an attic, crawl space, or basement. Ductwork should be as straight as possible with minimal bends, using rigid metal ducting rather than flexible duct where possible. In New Brunswick's climate, ensure the exterior termination has a proper damper and weatherproof cap to prevent cold air infiltration and ice buildup.

Installation requires electrical work that must be done by a licensed electrical contractor with a wiring permit from NB Power (1-800-615-0522). The electrical circuit typically needs to be dedicated 15-amp or 20-amp depending on the hood's power requirements. Final electrical inspection by Technical Inspection Services (TIS) at 1-888-659-3222 is required.

For homes built before 1990, consider having the existing electrical system evaluated before installation, as older wiring may not handle modern range hood loads safely. If you're planning a major kitchen renovation in municipalities like Moncton, Saint John, or Fredericton, you'll need a building permit that covers the ventilation modifications.

Professional installation is strongly recommended - improper ductwork routing or electrical connections can create safety hazards and code violations that affect your home insurance coverage.

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