Range Hood Cost Ontario 2026: Vented vs Recirculating, CFM Sizing, and OBC Requirements

When the Ontario Building Code Requires a Range Hood

Every dwelling in Ontario needs mechanical ventilation under OBC Section 9.32 and the Supplementary Standard SB-3. The kitchen specifically needs exhaust capable of at least 50 L/s (approximately 100 CFM) discharging directly to the exterior.[1] A properly vented range hood is the standard way to satisfy that rule, and it is mandatory anywhere a combustion appliance (a gas range, a gas cooktop, or a combination gas-electric range) is used.

The code exists for three reasons that all matter in real homes:

• Moisture removal. A single boiling pot puts roughly 200 grams of water into the air per hour. Without exhaust, that moisture ends up on windows, in drywall, and in attic insulation.
• Grease and particulate capture. Cooking aerosolizes fats and starches. Over years those particles coat cabinets, ceilings, and furnace filters.
• Combustion byproduct removal. Gas ranges produce carbon monoxide, nitrogen dioxide, and formaldehyde even when burning cleanly. Health Canada guidelines flag all three as indoor air quality concerns at kitchen concentrations.[9]

If you are doing a kitchen renovation, your permit plan examiner will want to see a range-hood specification sheet that confirms the CFM rating, the duct size, and the exterior termination. A recirculating-only hood is rejected on most new kitchens with any combustion appliance on the premises.

Vented vs Recirculating: The Only Decision That Really Matters

A vented range hood moves kitchen air outside through rigid metal ducting and terminates at an exterior wall cap or roof cap with a backdraft damper. It removes heat, grease, steam, smoke, and combustion byproducts from the home permanently.

A recirculating hood pulls air through a charcoal filter and a grease baffle, then blows the air right back into the kitchen. It captures some grease droplets and absorbs some odours, but it does nothing for moisture, carbon monoxide, or fine particulates. Charcoal filters saturate in six to twelve months and need replacement at $30 to $80 each.

Recirculating is the right call only when you have an electric range, a retrofit where running a duct would require cutting structural steel or crossing a condo demising wall, and you plan to use a separate exhaust fan or open window to meet the kitchen exhaust requirement. In every other case, vent to the exterior.[5]

CFM Sizing: Match the Hood to the Cooktop

CFM (cubic feet per minute) is the volume of air a hood moves at its maximum setting. Undersized hoods leave grease and moisture in the kitchen. Oversized hoods are noisy, waste energy, and often trigger the makeup-air requirement unnecessarily.

Home Ventilating Institute (HVI) guidelines and Broan-NuTone installation references agree on the following sizing framework:[3][5]

Two adjustments worth knowing. If the hood is mounted higher than 30 inches above the cooktop (a common look with decorative chimney hoods), step up one row in the table to compensate for the longer capture distance. If the hood is an island or peninsula mount with no wall to contain the plume, step up by roughly 200 CFM. Wall-mount hoods pull cleaner because the back wall acts as a baffle.

Installed Cost Ranges in Ontario, 2026

The all-in installed price depends far more on the ductwork and the makeup-air question than on the hood itself. Here is what an Ontario homeowner actually pays in 2026:

The single biggest cost driver between the middle rows is the duct run. A hood on an exterior wall with a direct-out termination is half the labour of a hood on an interior wall that needs duct run through ceiling cavities, around HVAC trunks, and out through a roof cap. Get the contractor to walk the duct path before accepting a quote, because that is where surprise change orders live.

The Makeup-Air Requirement for High-CFM Hoods

This is the rule that catches homeowners off guard. When a kitchen exhaust fan moves more than 400 CFM in a house with any fuel-burning appliance (gas furnace, gas water heater, gas fireplace, wood stove, or gas range itself), OBC Section 9.32 and CSA F326 require a dedicated makeup-air system to replace the air being exhausted.[4][7]

The physics is simple. A 600 CFM hood removes a volume of air equivalent to about one full air change in a typical Ontario kitchen every four minutes. If that air is not actively replaced from the outside, the house develops negative pressure. The nearest source of replacement air becomes whatever leaks easiest, and too often that is a backdrafting furnace flue or water-heater vent, pulling carbon monoxide into the living space.[8]

A compliant makeup-air system has three parts:

• An exterior intake with an insulated damper that opens when the range hood is turned on (typically interlocked via a pressure switch or a current sensor on the hood circuit).
• Ducting from the intake to a supply point near the kitchen, or into the return side of the central HVAC system.
• In most Ontario applications, an inline electric or hydronic heater that tempers the incoming air in winter to prevent a blast of freezing air every time the hood runs.

Equipment cost for a 600 to 900 CFM makeup-air unit runs $1,500 to $3,500 for the damper-only version and $3,500 to $6,000 for an electric or hydronic heated version. Install labour adds $800 to $2,000. The all-in delta from choosing a 600 CFM hood over a 400 CFM hood is usually $2,500 to $5,000 once makeup-air is in the plan.[6]

The practical takeaway: if your cooktop does not truly need 600+ CFM (most 30 inch gas ranges do not), stay at or below the 400 CFM threshold and avoid the whole makeup-air layer. Pro-style cooks who genuinely need the higher capture rate should budget for it up front rather than finding out mid-renovation.

Ducting Considerations

Good ducting is the difference between a hood that actually works and one that sounds impressive but leaves grease on the ceiling. Four rules cover most Ontario installs:

• Use rigid galvanized or stainless metal duct. Flexible aluminum and flexible insulated duct are not code-compliant for range hood exhaust because the ribs trap grease and the material can melt during a grease fire.
• Match or exceed the hood manufacturer's specified duct size. Reducing from a 6 inch hood collar to a 4 inch duct can cut effective airflow by 40 percent and dramatically increase noise.
• Minimize bends and length. Every 90 degree elbow is worth roughly 5 feet of straight duct in pressure loss. Keep total equivalent length under 25 feet for most residential hoods, or step up duct size to compensate.
• Terminate to the outside with a proper wall cap or roof cap that has a backdraft damper. Never terminate into an attic, soffit, or crawl space. Grease-laden moist air in an attic is a fire and mould problem waiting to happen.[7]

Seal every duct joint with foil tape or mastic (not fabric duct tape, which dries out and lets grease leak through). The duct should slope very slightly toward the exterior so any condensation drains outward rather than pooling against the damper.

How This Fits Into Your Indoor Air Quality Plan

A range hood is the single biggest lever you have for kitchen- generated pollutants, but it is not the whole indoor air quality picture. A properly sized bathroom exhaust fan handles shower moisture. An HRV or ERV provides continuous whole-house ventilation. A good MERV-13 furnace filter catches the fine particulates the hood misses. Together, those four pieces meet or exceed the OBC Section 9.32 requirements and the Health Canada residential indoor air quality guidelines.[9]

Households with gas cooking should also install a hardwired carbon monoxide alarm within 10 feet of every sleeping area, and ideally a second CO alarm in the kitchen itself. The Technical Standards and Safety Authority (TSSA) regulates gas appliance installation and inspections in Ontario, and TSSA incident reports consistently point to kitchen CO exposures when high-CFM hoods were installed without makeup-air.[8]

The Bottom Line

For most Ontario kitchens in 2026, a 300 to 400 CFM vented range hood installed through a short exterior wall duct is the right answer. Budget $700 to $1,500 all-in. Choose the hood for CFM and noise, not for looks alone, and keep the CFM at or below 400 unless your cooktop genuinely demands more (high-BTU pro-style gas). If you do go above 400 CFM, plan and price the makeup-air system from the start rather than discovering it at rough-in.

Recirculating hoods remain an acceptable fallback only for electric ranges in retrofit situations where venting is physically impossible. In any new kitchen with gas cooking, vent to the exterior or redesign the layout so you can.

Frequently Asked Questions