range-hood (Home Systems)

Range Hood

• What this is: how your kitchen range hood works, the two load-bearing safety risks (grease fire and CO backdraft), how to keep it safe, and what the strata owns vs you — for any BC home.
• Not: commercial kitchen exhaust systems (NFPA 96 applies to those, not residential); range hood selection and buying guide; fire suppression systems; oven and stove maintenance (see oven-stove (Home Systems)); gas appliance flue and venting (see gas-appliance-venting (Home Systems)).
• Figures: 2025–26 Metro Vancouver estimates — get your own quotes.

Bottom line

The rule (tripwire)

• If you see grease pooling or dripping inside the hood, or if the metal filter is visibly coated in dark solidified grease → clean the filter today and inspect the duct. A grease-saturated filter is a fire path between your stove and your duct. Don’t let it stay.
• If you have a high-CFM ducted hood (>400 CFM) and a natural-draft gas furnace or water heater → your home needs makeup air. Without it, the hood can depressurize the home and backdraft CO from the flue. This is an NBC Article 9.32.3.8 requirement.¹ If you’re unsure whether your home has this — ask a licensed HVAC tech.
• If your range hood is ductless (recirculating) → it does not remove moisture or CO from your kitchen. Grease and odours are filtered by activated charcoal; steam and combustion gases are not. This is important if you have a gas stove.

Recurring upkeep

• Clean the metal mesh/baffle filter monthly (or every 2–3 months for light cooks). Monthly cleaning is the grease-fire prevention task — the one action that keeps the duct path clear.²³
• Replace charcoal filters (ductless hoods) every 3–6 months. Charcoal filters cannot be washed — they must be replaced when saturated.⁴
• Wipe down the hood exterior and the inside canopy monthly to remove grease film before it hardens.

One-time setup

• Confirm your hood type (ducted-to-exterior vs recirculating). Look for a duct behind or above the hood exiting through the wall or ceiling; if there’s no duct, it’s recirculating. The safety story is different for each.
• Confirm your CFM rating. Check the model label. >400 CFM requires makeup air per NBC — a licensed HVAC professional should confirm the system is code-compliant.¹
• In a strata: confirm where the exhaust duct terminates and who owns the duct run. The duct that exits your unit and terminates on the building exterior is typically common property — your strata corporation is responsible for maintaining it.⁵ The hood and the section of duct inside your unit are yours.

Standing facts

• Ducted to exterior is always safer than recirculating — it removes grease, moisture, steam, odours, and combustion gases. Recirculating handles only grease and odour, not moisture or CO.
• Strata owners cannot pull a homeowner building permit in BC.⁶ Any ductwork modification that requires a permit must go to a licensed contractor.
• A new duct penetration through a strata’s exterior wall or roof is an alteration to common property — requires strata council approval under Standard Bylaw 8 before any work begins.

How it works — the one thing that matters

A range hood pulls air from the cooking surface into a capture zone above the burners, passes it through a grease filter (metal mesh or baffle), and exhausts it — either through a duct to the outside (ducted) or through a charcoal filter back into the room (recirculating).

Two separate load-bearing safety mechanisms:

Fire — the grease path. Every time you cook with oil or fat, grease-laden vapour rises into the hood. Metal mesh filters capture grease particles; over time the filter saturates. A saturated filter no longer traps grease — the grease coats the filter housing, the duct walls, and the fan. Grease is combustible. A stovetop grease flare-up has a direct path upward into a grease-loaded duct, which can propagate the fire into the wall or ceiling cavity. This is why professional kitchen codes (NFPA 96) require regular hood cleaning — the same physics apply in your home kitchen.⁷

CO — the depressurization path. A powerful ducted hood removes a large volume of air. In a tightly sealed home, that air must be replaced. If it is not replaced fast enough (no makeup air), the house develops negative pressure. Natural-draft gas appliances — a furnace, water heater, or boiler that relies on a rising column of warm flue gas to exhaust — can stall under negative pressure. When the flue gas can no longer rise, it reverses direction and spills into the living space: this is backdrafting. Backdraft gas contains carbon monoxide. This is why BC Building Code Article 9.32.3.8 requires makeup air for any exhaust fan in a home with a naturally venting combustion appliance, when the fan exceeds the home’s passive air-infiltration capacity.¹

So what: clean the filter to protect against fire. Understand your hood’s CFM and your home’s makeup-air situation to protect against CO. → A-Grease-Laden-Range-Hood-Filter-Is-a-Fire-Path-Not-Just-a-Dirty-Filter (Home Systems) and High-CFM-Ducted-Hoods-Can-Backdraft-Natural-Draft-Gas-Appliances-via-Depressurization (Home Systems)

Ducted vs recirculating in plain terms: ducted exhausts everything (grease, steam, CO, odour) to the outside. Recirculating passes air through activated charcoal (removing odour and some grease), then returns the air to the kitchen — moisture, steam, and combustion gases all stay inside.⁸ → Recirculating-Range-Hoods-Do-Not-Remove-Moisture-or-CO (Home Systems)

What goes wrong, and the warning signs

Watch for	What it means
Grease dripping or pooling in the filter housing	Filter is saturated — fire-path condition. Clean or replace now
Visible dark crust on mesh filter	Weeks or months of uncleaned grease — clean today, inspect duct
Hood fan running but little suction / smoke not being captured	Clogged filter, clogged duct, or failing fan motor
Smoke or grease smell after the hood is on	Grease escaping past a saturated filter, or a dirty duct recirculating smell
CO alarm triggering while hood runs at high speed	Possible backdraft — turn off hood, open windows, ventilate, call a gas technician
Greasy residue on surfaces far from the stove	Ducted hood leaking into the wall or ceiling cavity, or recirculating hood not filtering adequately
Hood is loud / rattling	Fan bearing wear, loose housing, or debris caught in fan — inspect and repair
Charcoal filter is >6 months old (ductless hood)	Replace — saturated charcoal no longer absorbs odour
No visible duct from hood to exterior	Recirculating — confirm this is intentional; if you expected ducted, investigate

What actually starts the fire or lets the CO in:

• Grease-saturated filter igniting from a stovetop flare-up — the dominant residential fire path. The filter acts as a wick, not a barrier.⁹⁷
• Grease buildup inside the duct propagating a fire — once grease coats the duct walls, a fire can travel from the hood to the exterior termination, potentially igniting framing materials it passes through.⁷
• Backdrafting under depressurization from a high-CFM hood — affects homes with natural-draft gas appliances and no makeup air.¹ The BC Building Code addresses this directly at Article 9.32.3.8.¹
• Fan motor failure — a seized motor causes the hood to pull little or no air, defeating both grease capture and ventilation.

When to replace vs repair

What you see	Do this
Fan motor seized / not spinning	Repair — motor replacement is usually $150–$300 in parts + labour; a young hood is worth it
Fan is noisy but spins	Repair — clean the fan blades first; replace the fan if cleaning doesn’t resolve it
Hood is >15–20 years old, multiple parts failing	Replace — the motor, wiring, and switches age together; cumulative repair cost exceeds value
Duct is grease-clogged and duct run is long or complex	Call a pro for duct cleaning ($200–$400 per system) before considering replacement
Grease fire inside the hood caused visible heat damage	Replace — internal heat damage to wiring is a hidden fire risk; do not continue using it
Hood chassis cracked, corroded, or structurally compromised	Replace — integrity failure
Light bulb or simple control failure	Repair — trivial part swap
Hood is recirculating but you want ducted (exterior vent)	Upgrade — requires ductwork + strata approval + possible permit; is irreversible once ductwork is cut through the wall

Verdict: Most range hood repairs (motor, lights, filters) are low-cost and reversible — do them without overthinking. The one decision that crosses the high-cost + irreversible threshold is converting from recirculating to ducted, which requires cutting through a wall or ceiling to the exterior (strata approval, possible permit, contractor). That decision earns the full The Decision Lifecycle treatment — weigh recirculating-hood limitations (no moisture/CO removal) against the structural and strata-approval complexity of ducting. Everything else is either a maintenance task or a straightforward appliance swap.

Typical cost (BC / Metro Vancouver)

Tier	What’s included	Range	Sources
DIY / parts only	Metal mesh filter (≈$20–$50); charcoal filter set ($30–$80); light bulb ($5–$15). Owner-doable cleaning tasks require no parts purchase if the hood is maintained.	$20–$80 for filter replacement	410 — indicative (limited sources)
Basic	Like-for-like under-cabinet or OTR hood swap, labour only, no new ductwork or electrical; existing duct and outlet reused	$300–$600 labour	1011 — indicative (limited sources)
Standard	Full replacement of under-cabinet or wall-mount hood — new hood unit ($200–$600) + labour + any minor duct fittings + haul-away of old unit; standard 30–36” hood, existing duct and electrical reused	$500–$1,200 installed	101112
Premium / upgrade	Island hood or chimney-style wall hood (unit $600–$2,000+) + all labour; OR recirculating-to-ducted conversion (new ductwork $400–$900 + possible drywall repair, permits, strata approval) + new hood; OR complex ceiling-exit routing	$1,200–$3,500+	101112

Metro Vancouver labour rates run 15–25% above national Canadian averages. Hood unit prices are available from Costco, IKEA, Best Buy, and appliance retailers — compare before buying. A recirculating-to-ducted conversion can easily push toward $2,000–$3,500 in a strata unit given the ductwork, drywall, finishing, and any required strata approval work. Get 2–3 written quotes — a quote far below Standard scope for the same job is a flag that ductwork or permit costs may be excluded.

DIY tier: filter costs are widely available from appliance retailers and online (Amazon.ca, ApplianceParts Canada). Verify your model number before ordering — filter dimensions are model-specific.

Indicative note: BC-specific range hood installation pricing is not widely published by Metro Vancouver contractors. The Standard and Premium tier figures are triangulated from US cost guides adjusted for Canadian labour rates plus Canadian appliance retailer data; treat as directional. Verify with a local quote.

How to maintain it — the procedures

Procedure: Clean the metal mesh filter — monthly (or every 2–3 months)

Why: grease accumulates in the mesh with every cook. A saturated filter is a fire hazard and reduces the hood’s airflow, defeating its own purpose. Monthly cleaning keeps the grease film thin enough to dissolve easily.²³

You’ll need: dish soap or degreaser (e.g., Simple Green, Dawn), boiling or very hot water, sink or large pot, non-abrasive brush or sponge; 20–30 min.

1. Turn off the range hood fan.
2. Slide or unclip the metal mesh filter (most filters unclip by pushing toward the fan and dropping down; consult your model’s manual).
3. Fill the sink with the hottest tap water available (or pour boiling water into a large pot). Add a generous squirt of dish soap and 1–2 tablespoons of baking soda.
4. Submerge the filter. Let soak 15–30 minutes. For heavy grease, use a degreaser spray first and let it sit 5 minutes before soaking.
5. Scrub gently with a non-abrasive brush. Grease should release. For stubborn buildup, repeat the soak.
6. Rinse thoroughly. Dry before reinstalling (a wet filter promotes rust on the housing).
7. Reinstall the filter and confirm it clicks into place securely.

Done when: the filter is visibly clean, no dark grease crust remaining, and the mesh is open (you can see through it clearly).

Stop and call a pro if:

• The filter housing is coated in thick, hardened grease — this indicates the duct may also be clogged (have a pro inspect the duct before continuing to use the hood).
• The filter is deformed, torn, or the mesh is damaged — replace rather than reinstalling a compromised filter.

---

Procedure: Replace charcoal filter (ductless hoods only) — every 3–6 months

Why: charcoal (activated carbon) absorbs odour and some grease vapour. Once saturated, it releases absorbed odours rather than capturing them, and it cannot be regenerated by washing.⁴⁸

You’ll need: replacement charcoal filter (model-specific — get the model number from the hood’s label or manual); 5 min.

1. Turn off the hood.
2. Remove the metal mesh filter (see above) to access the charcoal filter behind it.
3. Slide or unclip the charcoal filter. Note the orientation.
4. Slide in the new charcoal filter in the same orientation. Reinstall the mesh filter.

Done when: charcoal filter installed, mesh filter secured, hood turns on normally.

Stop and call a pro if: you cannot locate a replacement filter for your model (check ApplianceParts Canada or the manufacturer’s parts portal — do this before assuming the hood needs replacement).

---

Procedure: Inspect the duct termination — annually (ducted hoods)

Why: the exterior termination (the vent cap on the outside wall or roof) can become blocked by bird nesting material, lint, grease, or a stuck damper flap. A blocked termination prevents the hood from exhausting, causes backdrafting under the damper, and can be a nesting fire risk.

You’ll need: flashlight; access to the exterior vent cap; 5–10 min.

1. MUST identify the exterior termination location first — it is on the outside wall or roof directly in line with the duct run.
2. Have someone run the hood on high while you check the exterior vent. You should feel strong airflow and hear the damper flap open.
3. Inspect the vent cap: no bird nests, lint, grease buildup, or bent/stuck damper flap.
4. If the termination is on a high roof or inaccessible location in a strata building, do not climb — this is a strata common-property item; report it to your strata manager.

Done when: airflow confirmed at the exterior vent, no visible blockage, damper opens and closes freely.

Stop and call a pro if:

• Airflow at the exterior vent is weak or absent despite the fan running — the duct may be clogged internally.
• The vent cap is damaged, missing, or the damper is stuck open (creates a cold-air and pest entry point in winter).
• The termination is on a roof you cannot safely access.

---

Procedure: Wipe the hood canopy and fan blades — monthly

Why: grease film on the interior canopy and fan blades is the source of the smell that lingers after cooking. Left alone, it hardens and becomes much harder to clean, and it is itself flammable.

You’ll need: degreaser spray (Simple Green or kitchen degreaser), paper towels or cloth; 5–10 min.

1. Turn off the hood and let any hot surfaces cool.
2. Remove the filter.
3. Spray degreaser lightly on the interior canopy and fan housing. Let sit 1–2 minutes.
4. Wipe down with a cloth or paper towels.
5. MAY carefully wipe the fan blade edges (do not bend the blades). Do not spray liquid directly onto motor housing or electrical components.
6. Reinstall the filter.

Done when: no visible grease film on interior surfaces.

Maintenance calendar:

• Monthly: clean metal mesh filter; wipe interior canopy and fan housing.
• Every 3–6 months (ductless hoods): replace charcoal filter.
• Annually (ducted hoods): inspect exterior vent termination; confirm damper opens freely and airflow is strong.
• If you hear grinding, rattling, or notice significantly reduced suction: inspect fan blades for grease buildup or debris; if cleaning doesn’t resolve it, call an appliance technician.
• If a CO alarm triggers while the hood runs: immediately open windows, turn off gas appliances, and call a gas technician or gas safety line before resuming hood use.

Strata reality

Owner vs strata corporation — the split for range hoods:

• The range hood appliance itself — the hood unit inside your kitchen is part of your strata lot. You own it, maintain it, and are responsible for replacing it. This is the same as any other in-unit appliance.⁵
• The duct section inside your unit — typically part of your strata lot under Standard Bylaw 2, meaning you are responsible for maintaining it. However, if your registered bylaws shift this to the corporation (uncommon), verify before assuming.
• The duct section that runs through common property (through walls, ceiling cavities, or common service spaces) and the exterior vent termination — these are almost certainly common property under the SPA definition, which includes “ducts… for the passage of air, if they are located within a floor, wall or ceiling that forms a boundary between a strata lot and common property.”⁵¹³ The strata corporation is responsible for maintaining this portion.
• Case precedent note: a BC Civil Resolution Tribunal decision involving dryer exhaust vents (structurally identical to range hood ducts) determined the duct run through the building structure was common property and therefore the strata corporation’s responsibility.¹³

What this means practically:

• If your duct inside the unit is clogged → your responsibility to have it cleaned.
• If the exterior vent cap is clogged or damaged → report to strata manager; strata corporation is responsible.
• If you want to convert from recirculating to ducted → you must get strata council approval (Standard Bylaw 8) before any ductwork is cut through a wall. This is an alteration to common property.

SPA s.158¹⁴ chargeback risk: if a grease fire in your range hood hood causes water damage to neighbouring units during firefighting, the strata’s insurance deductible ($25K–$100K+) may be charged back to you. Documented regular filter maintenance (receipts for replacement filters, photos of clean filters) is your evidence that you exercised due care.

Strata and alterations:

• Any new duct penetration through an exterior wall or roof requires strata council approval under Standard Bylaw 8 and likely a City of Vancouver building permit.
• The strata corporation can refuse or condition approval. Get the approval in writing before starting work.

When you hire someone

Ask:

• Are you licensed and insured for appliance and ventilation work in BC?
• If ductwork modifications are needed: will you pull the required permits and coordinate with strata management?
• What is the CFM rating of the replacement hood, and does the home/unit have makeup air adequate for that CFM?
• If converting to ducted: how will the duct penetration be sealed to prevent fire spread through the wall cavity?
• Will you inspect the duct run as part of the installation?

Verify the work:

• Run the hood on high: strong airflow at the exterior vent, damper opens freely.
• No grease smell during operation.
• If new ductwork was installed: confirm the duct is rigid metal (not flex duct in the kitchen section — flex duct collects grease) and all connections are sealed with metal foil tape, not plastic tape.
• Permit issued and inspection passed if required.
• Manufacturer warranty registered.
• If a gas appliance is nearby: confirm no CO alarm activation during hood operation (if in doubt, request a depressurization check from the HVAC technician).

Who to call

These become real when filled in the Tier-B MOCs:

• Appliance repair technician (for motor, fan, or control repairs) → vendor-roster (Home Systems). Fill: company name, phone, and whether they service your hood brand.
• HVAC contractor (for ductwork, makeup air, or depressurization assessment) → vendor-roster (Home Systems). Fill: company name, phone, and licence number. For makeup-air questions, ask for a technician familiar with NBC Article 9.32.3.8.
• Strata manager (for duct termination maintenance, exterior vent repairs, or alteration approvals) → Strata MOC. Fill: after-hours emergency line, the process for alteration approvals, and who handles common-property duct maintenance.
• Insurer / broker → insurance-warranties (Home Systems). Fill: policy number, and whether a grease-fire event in the range hood is covered under your personal policy, and whether your policy requires any fire-safety maintenance documentation.

---

Sources

Idea Compass

North: Where this comes from

• Kitchen (Home Systems) — parent system
• gas-appliance-venting (Home Systems) — the combustion-venting physics that explain the depressurization risk
• BC Building Code Article 9.32.3.8 — the makeup-air requirement this note’s safety claim rests on

East: Tensions / failure

• A-Grease-Laden-Range-Hood-Filter-Is-a-Fire-Path-Not-Just-a-Dirty-Filter (Home Systems) — the fire failure mode
• High-CFM-Ducted-Hoods-Can-Backdraft-Natural-Draft-Gas-Appliances-via-Depressurization (Home Systems) — the CO failure mode
• Recirculating-Range-Hoods-Do-Not-Remove-Moisture-or-CO (Home Systems) — the limitation of ductless hoods

South: Where this leads

• vendor-roster (Home Systems) — the appliance tech and HVAC contractor named-resource cards
• insurance-warranties (Home Systems) — grease-fire coverage and maintenance documentation
• oven-stove (Home Systems) — the heat source the range hood serves; gas stoves add CO risk

West: What’s similar

• gas-appliance-venting (Home Systems) — same depressurization failure mode; different appliance
• dryer (Home Systems) — same duct-through-strata-structure responsibility split and exterior vent blockage risk
• The Strata Insurance Circularity Problem — the deductible-chargeback pattern if a fire starts in your hood and damages other units
• electrical-panel (Home Systems) — same DIY-vs-pro line pattern; same strata permit constraint

Footnotes

1. BC Building Code 2006 (the version of Division B Part 9 §9.32 available online, reflecting the NBC 2020 requirement carried forward into BC code) — Article 9.32.3.8: makeup air required where naturally aspirating fuel-fired appliances subject to backdrafting are present; makeup air fan must deliver air at rates equal to or not exceeding exhaust device capacity plus 10%, activated simultaneously with the exhaust device — https://free.bcpublications.ca/civix/document/id/public/bcbc2006/building_b_p9_9.32 ↩ ↩² ↩³ ↩⁴ ↩⁵

2. Coast Appliances, Canadian appliance retailer — recommended metal mesh/baffle filter cleaning frequency every 2–3 months, more frequently for heavy cooks; cleaning methods — https://www.coastappliances.ca/blogs/learn/how-to-clean-your-range-hood-filter-and-fan ↩ ↩²

3. B&W Fire Security Systems, Canadian fire safety company — monthly filter cleaning recommendation; grease-laden filter creates fire hazard in the duct — https://bwfiresecurity.com/blog/clean-range-hood-filter/ ↩ ↩²

4. Broan-NuTone LLC — charcoal filter replacement frequency: replace every 3–6 months; charcoal filters cannot be washed or reused — https://broan-nutone.com/en-us/home/learn/when-is-the-right-time-to-change-your-range-h ↩ ↩² ↩³

5. Province of BC, BC government — division of strata repair duties; Standard Bylaw 2 owner responsibility for strata lot; strata corporation responsibility for common property — https://www2.gov.bc.ca/gov/content/housing-tenancy/strata-housing/operating-a-strata/repairs-and-maintenance/division-of-repair-duties ↩ ↩² ↩³

6. Technical Safety BC, BC building safety regulator — strata owners cannot pull homeowner building permits and must hire licensed contractors — https://www.technicalsafetybc.ca/apply-for/permits/homeowner-permits/homeowner-electrical-permits ↩

7. NFPA 96, Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations — grease accumulation in residential hoods follows the same physics as commercial systems; grease-laden ducts are a documented fire propagation path (US standard, widely referenced in Canadian code) — https://www.nfpa.org/codes-and-standards/nfpa-96-standard-development/96 ↩ ↩² ↩³

8. GreenBuildingAdvisor — range hood makeup air: recirculating hoods pass air through charcoal and return it to the kitchen, removing odour but not moisture or combustion gases; backdrafting mechanism via depressurization — https://www.greenbuildingadvisor.com/article/makeup-air-for-range-hoods ↩ ↩²

9. Broan-NuTone LLC, the major residential range hood manufacturer — filter maintenance and grease fire hazard: “Grease buildup inside a filter can become a fire hazard if maintenance is neglected” — https://broan-nutone.com/en-us/home/learn/when-is-the-right-time-to-change-your-range-h ↩

10. Fixr.com — 2025 range hood installation cost data (US national averages; directionally applicable to Canada with regional premium): unit costs by type (under-cabinet $200–$500, wall-mount $200–$500, island $300–$900); labour for replacement ~$300;newductwork$300–$900;totalinstalled$500–$1,000 typical — https://www.fixr.com/costs/range-hood-installation ↩ ↩² ↩³ ↩⁴

11. Arspura — 2026 range hood installation cost breakdown by scenario: simple replacement $150–$300 labour; new installation with existing ductwork $300–$600; new ductwork through wall $500–$1,000; ceiling/roof routing $800–$1,500; island hood $1,000–$2,000+ — https://arspura.com/blogs/news/range-hood-installation-cost ↩ ↩² ↩³

12. HomeGuide — 2026 US national average range hood installation costs: replacement $300–$850; new installation with ductwork $650–$2,100; island hood with ceiling routing up to $2,000+;labour$85/hour average — https://homeguide.com/costs/range-hood-installation-cost ↩ ↩²

13. BCLI (BC Law Institute) CRT Roundup summary — BC Civil Resolution Tribunal decision: dryer exhaust vents running through strata structure were found to be common property under the Strata Property Act definition; strata corporation was held responsible for maintenance. Range hood ducts are structurally analogous — https://www.bcli.org/crt-roundup-repair-and-maintenance-bylaw-enforcement-and-more/ ↩ ↩²

14. Strata Property Act (BC Laws) — the governing statute (incl. ss. 135, 158, 164) — https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/98043_09 ↩