What to Specify for Apartments Affected by Second-Hand Cigarette Smoke

Second-hand cigarette smoke in apartment buildings can be difficult to manage because it does not always enter from one clear source. Odour and fine particles can move through corridors, gaps around doors, penetrations in shared walls and connected ventilation pathways, so the right approach is usually about containing pathways and upgrading filtration where the system allows it.

For property managers and facility managers, the key is to specify filters and supporting measures that suit the building’s mechanical setup, access conditions and maintenance capability, rather than relying on a single product to solve every complaint.

Start with the airflow path, not just the filter

Before specifying a filter upgrade, look at how air is actually moving through the apartment, the corridor and any shared plant. In many buildings, smoke odour is carried by leakage and pressure differences as much as by the ventilation system itself.

Check for:

• •Gaps around entry doors, service penetrations and poorly sealed skirting or trims
• •Transfer paths through return air grilles, shafts or common exhaust systems
• •Shared or interlinked bathroom, laundry or kitchen exhaust arrangements
• •Corridor pressurisation issues that can pull odour into units

If the building has an existing mechanical ventilation strategy, confirm the site requirements with the mechanical services engineer or building owner. AS 1668.2:2024 may be relevant to the ventilation design and operation, but the right specification still depends on the actual system in the building.

What a filter can do in smoke-affected apartments

A suitable filter can capture airborne particles associated with cigarette smoke, including very fine particles that may otherwise circulate through the system. Filters do not stop odour by themselves, so it helps to be clear about the difference between particle control and smell control when specifying equipment.

For apartment applications, consider whether the goal is:

• •Better particle capture in a central air handling system
• •Improved cleaning of recirculated air in a corridor, lobby or common area
• •Protection of fans, coils and ductwork from build-up linked to smoke-laden air
• •Support for localised filtration in a problem area where smoke enters repeatedly

If occupants have ongoing concerns about exposure or symptoms, they should seek advice from a medical professional. From a building management perspective, the practical focus is on reducing the movement of smoke and improving filtration where it can be installed and maintained properly.

Filter types to consider

Pleated panel and bag filters

Where the system can handle higher resistance, a pleated or bag filter upgrade is often the first place to look. These filters generally offer more surface area than a basic panel filter, which can help with dust and smoke particle capture in air handling equipment.

When specifying, check:

• •The available filter depth and frame size
• •Whether the fan can accommodate the pressure drop of the selected filter
• •Seal quality in the holding frame, because bypass air defeats the purpose of the filter
• •Whether the system is intended for coarse filtration only or a finer stage as well

Many apartment buildings still use older grade designations such as G3, G4 or F5 to F9. These are EN 779 classes that remain widely used in Australia, although ISO 16890 is now the current standard family. Avoid assuming a direct conversion between rating systems when specifying replacements.

Fine particle filtration

If the complaint is more about visible haze, lingering smoke and ultrafine particle loading, a finer filter stage may be needed, provided the system is designed for it. In some applications, a two-stage arrangement works better than trying to make one filter do everything.

A practical specification may include:

• •A coarse pre-filter to catch larger dust and debris
• •A finer secondary filter for smoke-related particulate load
• •Tight sealing at the frame to reduce leakage around the media

Where very high-efficiency filtration is being considered, HEPA may be relevant in specialised applications. Under EN 1822, H13 is at least 99.95% efficient and H14 is at least 99.995% efficient at the most penetrating particle size. Those grades are not suitable for every apartment system, so pressure drop, fan capacity and service access must be checked first.

Odour control media

Smoke odour often needs adsorption media as well as particulate filtration. In the right application, activated carbon or a carbon blend can help address odour carried in the air stream, but the media must be selected to suit the airflow rate and contaminant load.

Ask whether the filter arrangement should include:

• •Carbon impregnated media for odour control
• •A dedicated carbon stage after particle pre-filtration
• •A compact cassette or custom frame where space is limited

Odour media saturates over time, and its useful life depends on the site conditions and the amount of smoke entering the system. It should be inspected as part of normal maintenance checks, with replacement based on condition rather than a fixed calendar schedule.

Seal the system as carefully as you specify the media

A high-grade filter will not perform properly if air is bypassing around it. In apartment buildings, poor frame fit, warped holding tracks, loose access doors and gaps in ductwork can all undermine the result.

Good specification should include:

• •Correct filter dimensions and frame depth
• •Compatible gasket or sealing method
• •Rigid mounting that prevents movement or collapse
• •Easy access for safe inspection and change-out

If you need to verify the size of an existing filter, use a reliable measuring method rather than ordering by guesswork. Our guide on how to measure an air filter can help before you place an order.

For sites with non-standard housings, custom sizes may be the practical answer. In those cases, custom air filters can help match the existing frame and reduce the chance of leakage.

Maintenance planning for occupied apartment buildings

Smoke-related complaints often come back when the system is not being checked closely enough. For buildings with higher dust load or ongoing odour issues, inspection frequency should be based on the system design, site conditions and the pressure drop across the filter where gauges are fitted.

A maintenance plan should cover:

• •Visual inspection of filter condition and sealing surfaces
• •Pressure drop monitoring where the system has gauges or sensors
• •Checks for bypass leakage, damaged frames or distorted media
• •Confirmation that replacement filters match the intended specification

Some filters are designed to be washable - check the product instructions before cleaning or reusing them. Do not assume a washable product is suitable for every apartment system, especially where odour control or fine particle capture is important.

If the building already uses a service contractor, ask them to report on the actual condition of the filter bank rather than simply changing filters on a routine schedule. For sites that need more structured support, commercial filter servicing may be a useful option.

Specifying for practical building outcomes

When an apartment is affected by second-hand smoke, the best specification usually combines several measures rather than relying on one product type. That may mean better door sealing, a more suitable pre-filter and final filter combination, a carbon stage for odour, and careful maintenance of the existing ventilation path.

Useful questions to answer before ordering:

• •Where is the smoke entering, and through which pathway?
• •Can the current fan handle a finer filter without compromising airflow?
• •Is odour control needed, or mainly particle capture?
• •Is the filter housing standard, or will a custom size be needed?
• •Who will inspect the filters and monitor condition over time?

For managers overseeing multiple tenancies or mixed-use residential sites, it can help to align the filter specification with a broader service plan. Our filter servicing information is a good starting point if you are reviewing an existing maintenance arrangement.

Talk to Total Air Filtration

Total Air Filtration is a family-owned air filter manufacturer and supplier based in Hillcrest, Brisbane QLD, established in 2009. We can help you specify or make the right filters for smoke-affected apartment systems, including standard and custom options.

Call 07 3800 3448 or request a quote. You can also view our products or contact us if you need help matching an existing filter arrangement.