Commercial Kitchen Ventilation and Hood System Guide 2026: Types, Specs and FOB Pricing

Why Commercial Kitchen Ventilation Is a Non-Negotiable Specification

Heat, grease vapour, steam, and combustion by-products accumulate in a commercial kitchen faster than most operators anticipate. Without a correctly sized and configured extraction system, kitchen temperatures routinely exceed 45°C, fire risk increases sharply, and health department inspections fail on ventilation non-compliance. More practically: fatigued kitchen staff working in excessive heat produce slower, lower-quality output — a measurable operational cost that most project budgets never account for.

Yet ventilation is frequently one of the last items specified in a commercial kitchen project, and one of the most commonly under-specified. This guide covers the types of hood systems available, how to calculate airflow requirements, material specifications, fire suppression integration, and what to budget for FOB equipment pricing in 2026.

Types of Commercial Kitchen Exhaust Hoods

The right hood type depends on the cooking equipment below it, the kitchen geometry, and the building’s make-up air strategy.

Wall-Canopy Hoods

Mounted against a wall, canopy hoods are the most common configuration for linear cooking suites (range, oven, fryer line). They require equipment positioned flush against the wall and should overhang the cooking surface by 150–300mm on each exposed side to capture rising thermal plumes effectively. Wall-canopy hoods are the most cost-efficient type: the back wall acts as a baffle, reducing the airflow volume needed compared to island configurations.

Island (Double-Island) Hoods

Where cooking equipment is positioned in the centre of the kitchen with no adjacent wall, an island hood is required. Island hoods must capture on all four sides, requiring approximately 20–30% higher airflow rates than wall configurations for equivalent cooking loads. They are more expensive to fabricate — typically USD 180–450 per linear metre for standard SUS304 versions — and require more complex make-up air distribution to avoid short-circuiting.

Proximity (Low-Profile) Hoods

Proximity hoods are positioned 500–700mm above the cooking surface rather than the standard 1,900–2,100mm ceiling-mounted position. Because they capture grease vapour and steam close to the source, they require 40–60% less airflow than overhead canopy hoods for equivalent capture efficiency. This makes them valuable in kitchens with low ceilings or where energy costs are a concern. The trade-off is that they constrain working space around cooking equipment and require more frequent cleaning.

Backshelf Hoods

Designed for countertop cooking equipment (salamanders, griddles, light-duty fryers), backshelf hoods mount directly behind and above equipment on the counter surface. They are not suitable for high-output open-flame ranges but are cost-effective for light-duty and supplemental extraction applications.

Airflow Calculation: How to Size Your Extraction System

Extraction airflow is measured in cubic metres per hour (m³/h) in metric systems, or cubic feet per minute (CFM) in US-standard specifications. The two primary sizing methods are:

Method 1: Equipment Heat Load

Each piece of cooking equipment generates a calculable quantity of heat. As a working rule of thumb for preliminary design:

• Heavy-duty cooking (charbroilers, open-flame ranges, woks): 900–1,400 m³/h per linear metre of hood
• Medium-duty cooking (griddles, fryers, steamers): 600–900 m³/h per linear metre
• Light-duty cooking (ovens, bain-maries, pasta cookers): 350–600 m³/h per linear metre

Method 2: Velocity-Based Calculation

Design face velocity at the hood opening should be 0.25–0.35 m/s for Type I hoods (grease-laden vapour extraction) and 0.15–0.25 m/s for Type II hoods (heat and steam only). Multiply the face area of the hood opening by the target velocity to determine required airflow volume.

For projects in tropical or high-ambient-temperature climates, add a 15–20% safety margin to calculated airflow — equipment runs hotter than its rated output when ambient temperatures exceed 35°C, increasing thermal load on the extraction system.

Type I vs Type II Hoods: A Critical Distinction

This classification determines fire suppression requirements and duct construction standards.

Type I hoods are required over all cooking equipment that produces grease-laden vapour: fryers, griddles, ranges, charbroilers, woks, and combi ovens on roast cycle. Type I hoods require grease filters (baffle-type or mesh), a grease collection channel, a grease trap, and a fire suppression system integrated into the plenum. Ductwork must be constructed of minimum 1.2mm galvanised steel or SUS304, fully welded with no riveted joints, and must maintain a minimum 1° slope toward the grease drain.

Type II hoods handle heat and steam from equipment that does not produce grease vapour: dishwashers, steamers, heated holding units. They have simpler construction requirements — no grease filtration or fire suppression mandated — but check with your local authority having jurisdiction (AHJ), as some markets require Type I treatment for combi ovens regardless of cooking mode.

Material Specifications for Commercial Kitchen Hoods

The standard material for commercial kitchen hoods in most markets is SUS304 stainless steel, 1.0–1.2mm gauge for formed sheet components and 1.5–2.0mm for structural members. SUS304 provides adequate corrosion resistance for most commercial kitchen environments.

Upgrade to SUS316L when the kitchen is in a coastal environment with high airborne salt content, when cooking processes involve high-chloride materials (brine, heavily salted seafood), or when the project specification explicitly requires it. SUS316L adds approximately 25–35% to material cost — worthwhile in aggressive environments, unnecessary expenditure in inland continental climates.

Internal duct surfaces should be smooth and continuously welded to prevent grease accumulation at seams. External surfaces are typically finished to #4 brushed (180-grit) — the standard commercial kitchen aesthetic that shows cleaning marks least.

Make-Up Air: The Half of Ventilation Most Projects Get Wrong

Extraction systems remove air from the kitchen; make-up air (MUA) systems replace it. If make-up air is inadequate, the kitchen operates under negative pressure: doors are hard to open, smoke and odours are drawn into adjacent dining areas, and extraction efficiency drops because the hood cannot maintain capture velocity against the pressure differential.

Make-up air should supply 80–90% of the extracted volume (not 100%, to maintain slight negative pressure relative to adjacent areas). It should be introduced in a way that does not disturb the thermal plume at the cooking surface — short-circuiting between the MUA supply point and the exhaust hood is the most common design error in commercial kitchen ventilation.

In climates above 35°C ambient, make-up air may need to be cooled — either through mechanical cooling or evaporative pre-cooling — to avoid fighting the kitchen’s existing heat load with hot replacement air. This is a particularly significant consideration for hotel kitchens in the Gulf region and sub-Saharan Africa.

Fire Suppression Integration

Type I hood systems must incorporate a fire suppression system. The two main technologies are:

Wet chemical systems (the most common in commercial kitchens globally) use potassium carbonate-based agents delivered through nozzles positioned above cooking equipment and in the duct entry. On activation, the agent saponifies cooking oil, cooling the fire and preventing re-ignition. Wet chemical systems require 6-monthly inspection and annual servicing.

CO₂ systems are used in high-temperature or high-risk applications where wet chemical agents may not perform adequately. They require more complex installation and safety interlocks.

Ensure your hood specification includes pre-wired conduit runs and nozzle mounting brackets for the suppression system, even if suppression is supplied and installed by a local contractor — retrofitting suppression nozzles into a hood that was not pre-designed for them is expensive and aesthetically poor.

FOB Pricing Reference (2026)

The following prices reflect factory-direct pricing for SUS304 commercial kitchen ventilation equipment manufactured in China, available with custom fabrication to project-specific dimensions:

• Wall-canopy hood (1,800mm × 900mm × 500mm, SUS304, with baffle filters): USD 380–680 FOB
• Wall-canopy hood (2,400mm × 900mm × 500mm, SUS304): USD 480–820 FOB
• Island hood (2,000mm × 1,400mm × 500mm, double-sided): USD 680–1,100 FOB
• Proximity hood (1,800mm wide, complete with grease tray): USD 520–850 FOB
• Grease baffle filter set (508mm × 457mm, SUS304): USD 22–38 per filter
• Rectangular exhaust duct (300mm × 300mm, per metre, SUS304): USD 28–55 FOB
• Centrifugal roof exhaust fan (3,000–5,000 m³/h): USD 580–980 FOB

Custom-fabricated hoods to project-specific dimensions carry a 20–35% premium above catalogue sizes and a 35–55 day lead time from drawing approval. For hotel projects requiring complete ventilation packages — hoods, ductwork, fans, and make-up air units — full system quotations can be provided as a single line item, simplifying both budgeting and supplier accountability.

Maintenance and Cleaning Requirements

Grease accumulation in hoods and ductwork is the leading cause of commercial kitchen fires globally. Cleaning frequency should reflect actual cooking load:

• High-volume cooking (>18 hours/day, high-grease output): Monthly hood and duct cleaning
• Medium-volume (12–18 hours/day): Quarterly cleaning
• Light-duty (under 12 hours/day, low-grease cooking): Semi-annual cleaning

Baffle filters should be removed and washed in a high-temperature dishwasher daily or weekly depending on cooking volume. Grease traps should be emptied and cleaned at the start of each service. When specifying hoods, ensure that all filter banks are accessible without tools, and that the grease collection channel is designed for quick-release removal — hoods that require tools to access filters are routinely under-cleaned in operational kitchens.

FAQ

Specifying ventilation for a hotel, restaurant, or food service project? Our export team is ready to support your project with custom-fabricated hoods, complete ventilation packages, and factory-direct pricing — WhatsApp +86 158 1364 3427 or email project@gracekitchen.com.