Managing Odour Transfer Between Café Kitchen and Adjacent Retail Tenancies

Cooking odours are part of normal café operation, but they should not be drifting into the neighbouring boutique, office or retail tenancy. In mixed-use hospitality strips, smells often move through shared ceiling spaces, wall penetrations and return air paths that were never intended to carry kitchen exhaust. The good news is that with the right ventilation design, sealing and filter strategy, odour transfer can usually be managed much more effectively.

Why odours move between tenancies

In a mixed-use building, air takes the easiest path. If the café kitchen is operating under negative pressure, exhaust is not fully captured, or there are gaps in the building envelope, cooking odours can migrate into adjacent tenancies and common areas.

Common pathways include:

• •Leaky shared ceiling spaces above shopfronts and tenancy walls
• •Unsealed penetrations for pipes, cables and services
• •Shared or poorly separated return air paths
• •Exhaust discharge that is too close to outdoor air intakes or operable openings
• •Pressure imbalances caused by fans, air conditioning and door traffic

Odour complaints are often a sign that the air system and tenancy separations are not working together. In practice, the issue may involve the kitchen exhaust, the make-up air arrangement, the return air system, or the building fabric itself.

Start with source capture at the kitchen

The first control point is the cooking source. If odour is escaping the kitchen before it reaches the exhaust system, the rest of the building will struggle to contain it.

A commercial kitchen should have extraction that is sized and located for the equipment being used, with capture points positioned to suit cooking methods and plume movement. Rangehoods, canopy geometry and airflow balance matter just as much as fan selection.

For landlords and mechanical contractors, the main checks are:

• •Canopy coverage over the actual cooking line
• •Adequate capture of heat, vapour and grease-laden air
• •Correct balance between exhaust and make-up air
• •No short-circuiting where supply air pushes odours out of the hood face
• •Grease and particulate filters that are matched to the application

If the kitchen is overloaded with equipment changes or menu changes, the original extraction arrangement may no longer be appropriate. In that case, the system should be reviewed by the mechanical services engineer or building owner against site requirements and AS 1668.2:2024.

Separate the café from the retail tenancy

Odour transfer is often made worse by weak separation between tenancies. Even a good exhaust system can struggle if the building envelope allows air to move freely through shared zones.

Practical measures include:

• •Sealing gaps around pipework, service penetrations and cable trays
• •Improving the integrity of tenancy walls and bulkheads
• •Checking that ceiling plenums are not acting as open air corridors
• •Confirming that fire and acoustic seals are intact after maintenance work
• •Making sure access panels and removable ceiling tiles are properly fitted

This is especially important where a café sits beside a retail tenancy with different operating hours. When one tenancy is closed and the other is busy, pressure differences can pull odours through cracks and ceiling voids.

If there is recurring transfer, it is worth inspecting the shared ceiling zone with both the tenancy fitout and the mechanical system in mind. Problems are often found where the two trades meet: above walls, around duct penetrations, or where old fitouts have been modified without fully restoring separation.

Manage return air and pressure balance

Return air paths deserve close attention in mixed-use strips. If the café or adjoining tenancy returns air through shared ceiling spaces, odours can circulate instead of being exhausted.

Good practice is to keep kitchen exhaust air separate from supply and return air streams wherever possible. The system should be arranged so that odorous air is extracted and discharged appropriately, not drawn back through other occupied areas.

Useful checks for facilities teams and contractors include:

• •Verifying that return air does not pull from kitchen-adjacent ceiling voids
• •Checking that door undercuts and transfer grilles are not unintentionally linking tenancies
• •Testing whether supply air is creating excessive positive or negative pressure in one tenancy
• •Confirming fan operation after tenancy changes or fitout alterations
• •Looking for reverse airflow at leakage points during busy trading periods

Where pressure control is poor, a tenant may notice odours most strongly when the café opens, when exhaust fans start, or when the air conditioning system changes mode. These operational patterns can provide clues about how air is travelling through the building.

Use filtration to support odour control

Filters are not the whole answer, but they are an important part of a broader odour management strategy. In kitchen exhaust and adjacent HVAC systems, the right filter setup can help capture grease and fine particulates before they build up in ductwork or spread through the system.

For cooking applications, filter selection should suit the equipment, airflow and maintenance access. In some cases, a combination of grease filters and finer filtration downstream may be appropriate, provided the system is designed for it and pressure drop is monitored where gauges are fitted.

A few practical points:

• •Use filters that are designed for the operating conditions of the system
• •Check whether some filters are designed to be washable, and follow the product instructions
• •Inspect filter loading according to site conditions and dust or grease load, not a fixed calendar only
• •Replace or clean filters when pressure drop indicates restriction, where monitoring is available
• •Follow the filter and equipment manufacturer instructions

If the tenant mix changes, filter requirements may change as well. A café with light prep is very different from a kitchen producing heavy frying or grilling odours. Matching the filter arrangement to the real operating profile is far more effective than relying on a generic setup.

Maintenance, inspections and fitout changes

Odour issues often reappear after maintenance work because a small change in the building has altered airflow. A new tenancy wall, a changed exhaust route, or an extra ceiling opening can be enough to create a path for smells.

That is why ongoing inspection matters. The frequency depends on the system, site conditions and dust load, as well as how intensively the kitchen is used. For managed sites, it is sensible to include the kitchen exhaust, roof discharge points, return air paths and ceiling separations in routine inspections.

When reviewing a site, ask:

• •Has the café menu or cooking equipment changed?
• •Have any tenancy walls, ceilings or services been altered?
• •Are filters being inspected and maintained to manufacturer instructions?
• •Is there evidence of grease build-up or damaged ducting?
• •Are neighbouring tenants reporting odour at specific times?

If a building keeps having the same complaint, the answer is rarely found in one component alone. It is usually a combination of source control, air balance, separation and maintenance.

Choosing the right filter support for the building

Different buildings need different filter solutions, and some systems benefit from custom sizing or replacement filters matched to the existing frame. Where access is tight, equipment is older, or the layout has been modified, off-the-shelf products may not be the best fit.

Total Air Filtration is a family-owned air filter manufacturer and supplier in Hillcrest, Brisbane QLD, established 2009. We work with landlords, facilities teams and mechanical contractors who need practical filter support for commercial sites, including hospitality strips and mixed-use buildings.

If you need replacement filters, a custom solution or advice on an existing setup, we can help with our products, custom air filters and filter servicing.

For tailored support, call 07 3800 3448 or request a quote.