Air Purifier
An air purifier improves indoor air by removing particles and pollutants—pollen, dust, mould spores, pet dander, smoke and odours—using filters such as HEPA and activated carbon. In Australia, air purifiers are used in homes, offices, schools and in restoration and mould work. This guide explains how they work, which type to choose for allergies, mould, smoke or dust, how to size one for your room, and where to buy air purifiers in Australia from Thorair, including HEPA air purifiers and air scrubbers for commercial and restoration use.
Why Use an Air Purifier?
Fewer allergens
Air purifiers with HEPA filters capture pollen, pet dander, dust mites and similar particles that can trigger allergies and asthma. Running a purifier in bedrooms and main living areas can help reduce exposure and improve comfort for many people.
Mould spores and dust
During and after mould growth or remediation, spores and fine dust can stay in the air. HEPA filtration helps remove them. In everyday use, an air purifier also reduces general dust and can make cleaning and breathing easier.
Smoke and odours
HEPA filters capture smoke particles; units with activated carbon layers can reduce odours from smoke, cooking, VOCs and chemicals. That can help in homes, offices and after fire or restoration work.
Cleaner air at home and work
In bedrooms, living rooms, offices and nurseries, an air purifier can support better air quality when used with good ventilation and housekeeping. In restoration and trade, HEPA air scrubbers are standard for containment and cleaner air.
How Air Purifiers Work
Fan and airflow
An air purifier draws room air through one or more filters with a fan, then returns filtered air to the space. The cleaner the filters and the higher the airflow (often in m³/h or CFM), the more particles are removed per hour. Placement and run time affect how much of the room is treated.
Pre-filter, HEPA and carbon
Many units use a pre-filter to catch larger dust and hair, which extends the life of the main filter. The HEPA filter captures fine particles (pollen, spores, bacteria, fine dust). An activated carbon (or charcoal) layer adds gas and odour reduction. Not all air purifiers have all three; for particles, HEPA is the most important.
CADR and room coverage
CADR (Clean Air Delivery Rate) indicates how much clean air a portable air purifier delivers for dust, pollen and smoke. The manufacturer usually states a recommended room size in m² or m³. Match the unit to your room: too small and it won’t turn over the air enough; too large may be noisier or more costly than you need.
Run time and placement
For best effect, run an air purifier for long periods or continuously. Keep inlets and outlets clear of walls and furniture. In a single room, central placement often works well. For larger or open-plan areas, use a larger unit or more than one. In restoration, scrubbers are often run for the full cleanup and as advised for clearance.
What Air Purifiers Remove from the Air
Particles: pollen, dust, spores and more
HEPA filters capture at least 99.97% of particles at 0.3 microns, including pollen, dust mites, mould spores, pet dander, many bacteria and some viruses. They also trap larger lint and dust. Standard fibre filters capture bigger particles but let finer ones through; for allergens and spores, HEPA is the standard.
Gases and odours (with carbon)
Activated carbon absorbs gases, VOCs and odours from smoke, cleaning products, cooking and new materials. HEPA alone does not remove gases. If odours or chemicals are a concern, choose an air purifier with a carbon stage and replace it as recommended.
Types of Air Purifiers
Portable room air purifiers
Standalone units for one or a few rooms. Most use HEPA and often carbon. Sized by room volume or CADR; suitable for homes, offices and small commercial spaces. Portable so you can move them between rooms.
- For bedrooms, living rooms, nurseries, home offices
- HEPA and often carbon; check filter life and cost
- Size by room size (m² or m³) or CADR
- Low to medium noise; many have fan speeds
Air scrubbers with HEPA
Larger, higher-airflow units for water damage restoration, mould remediation, renovation and fire cleanup. They move more air, often support ducting and negative pressure, and usually have HEPA and sometimes carbon. Used by restorers and trades.
- Higher airflow for bigger spaces and restoration
- HEPA and often carbon for spores, dust and odours
- Ducting for containment and targeted delivery
- Portable but heavier; built for trade use
Commercial and industrial air purifiers
Larger fixed or mobile systems for workshops, open-plan offices, healthcare-style settings and industrial applications. Higher capacity, longer filter life and built for continuous or heavy use. May include pre-filters and duct connections.
- For large rooms, open plan and commercial buildings
- Often compatible with ducting
- Built for 24/7 or sustained operation
- Pre-filters to extend HEPA life
In-duct and whole-house systems
Installed in ducts or HVAC to treat air across the whole building. Requires professional installation and is often combined with upgrades to the central system. Different from portable or scrubber units; choose if you want building-wide filtration.
- Whole-house or whole-building coverage
- Needs HVAC/ductwork and professional fit-out
- Ongoing filter changes and system maintenance
- Higher upfront cost; discuss with an HVAC provider
Choose an Air Purifier by Concern
Air purifier for allergies
For hay fever, dust and pet allergies, a HEPA air purifier can help reduce airborne pollen, dust mites and pet dander. Run it in bedrooms and main living areas, especially in peak seasons. Size it for the room and prefer true HEPA over "HEPA-type" filters.
- True HEPA (H13 or H14) for fine particles
- Size for the room; run during high-exposure times
- Replace filters on schedule for consistent performance
Air purifier for mould
HEPA captures mould spores from the air during and after mould growth or remediation. It does not remove mould on surfaces—cleaning or remediation is still required. Pair an air purifier or scrubber with dehumidification to control humidity and limit regrowth.
- HEPA for spores; air scrubbers for larger or containment jobs
- Use with dehumidifiers to control moisture
- Run during and after mould cleanup as advised
Air purifier for smoke and odours
HEPA traps smoke particles; activated carbon helps with odours from smoke, cooking and VOCs. Choose a unit with both HEPA and a substantial carbon layer. For fire restoration, HEPA air scrubbers with carbon are commonly used.
- HEPA plus activated carbon for particles and odours
- Replace carbon when odour reduction drops
- Scrubbers for post-fire and heavy smoke odours
Air purifier for dust and pet dander
Dust and pet dander are largely particles, so a HEPA air purifier is well suited. Run it in rooms where pets spend time and where dust builds up. Regular vacuuming and cleaning support the effect of the purifier.
- HEPA for fine dust and dander
- Pre-filter can extend HEPA life in dusty or pet-heavy homes
- Run consistently for better results
Choosing an Air Purifier by Room and Space
Match the unit’s coverage (m², m³ or CADR) to your room size. Ceiling height, open doorways and layout affect how well one unit covers the space. For open plan or very large rooms, use a larger unit or several purifiers.
A portable air purifier sized for the room is often enough. Run it overnight for allergies and dust. Prefer a quieter model and one with a sleep or low-speed mode. View air purifiers suitable for bedrooms.
Use a larger portable unit or more than one. Check the stated coverage and, for open-plan areas, consider total volume. HEPA and carbon help with dust, allergens, cooking and general odours. Shop air purifiers for living areas.
Portable HEPA purifiers work in small offices and meeting rooms. For larger open-plan or commercial spaces, use commercial-grade units or several portables. Consider noise and run time (e.g. during work hours or 24/7).
HEPA air scrubbers are standard for water damage, mould and fire. Size by room or zone; use ducting for containment. Pair with dehumidifiers and air movers for full drying and cleaning.
Features to Look For in an Air Purifier
True HEPA filter
Choose HEPA that meets defined efficiency (e.g. 99.97% at 0.3 µm). "HEPA-type" or "HEPA-like" is usually less strict. H13 and H14 are common and suitable for most home and light commercial use.
Activated carbon (for odours)
If you need odour or VOC reduction, pick a model with a real carbon layer, not just a thin sheet. Check how often it needs replacing and the cost.
Right-sized coverage
Check the recommended room size or CADR. A unit rated for a larger room can work in a smaller one (often on a lower speed); one too small will underperform.
Filter life and cost
HEPA and carbon need regular replacement. Compare filter lifespan and price so you can budget and maintain performance.
Noise and fan speeds
For bedrooms and offices, check noise levels at low or sleep mode. Multiple fan speeds give flexibility between quieter running and faster cleaning.
Australian compliance
For electrical safety in Australia, choose units that meet local standards. Thorair’s air purifiers and air scrubbers include options suited to Australian use.
Understanding HEPA in Air Purifiers
What is HEPA?
HEPA (High Efficiency Particulate Air) filters remove at least 99.97% of particles at 0.3 microns in standard tests. They also capture most larger and many smaller particles—pollen, spores, bacteria, fine dust and some viruses. True HEPA meets defined test methods; "HEPA-type" or "HEPA-like" filters generally do not meet the same bar and can let more fine particles through.
HEPA grades: H13, H14 and more
HEPA is often classified by grade. H13 is common in room purifiers and many scrubbers. H14 and above offer slightly higher retention. For most homes, mould work and light commercial use, H13 is sufficient when the unit is sized and maintained correctly. Choose true HEPA over HEPA-type when you can.
HEPA and carbon: different jobs
HEPA removes particles; it does not remove gases, VOCs or odours. Activated carbon targets gases and odours. For both particles and odours, use an air purifier with HEPA and a proper carbon stage. Replace each according to the manufacturer’s instructions.
Air Purifier vs Dehumidifier
Different roles
An air purifier filters particles (and with carbon, some gases) from the air. A dehumidifier removes moisture and lowers humidity. Both can help with mould: dehumidifiers reduce the damp that mould needs; air purifiers capture spores. For mould, use both where appropriate. For allergies and dust, an air purifier is the main tool; for damp, musty smells and moisture damage, a dehumidifier is. Thorair supplies air purifiers and dehumidifiers for home and commercial use.
Air Purifiers and Ventilation
Use together
Ventilation (opening windows, exhaust fans, balanced systems) brings in fresh air and dilutes indoor pollutants. Air purifiers clean the air already in the room. They work well together: ventilate when outdoor air is clean and when you need to lower CO₂ or moisture; run an air purifier to reduce particles and, with carbon, some odours. In cold, hot or smoky conditions, an air purifier can help when you can’t or don’t want to ventilate as much.
Maintenance and Filter Replacement
Replace HEPA on schedule
Clogged HEPA filters reduce airflow and performance. Follow the manufacturer’s replacement interval. In dusty homes or during restoration, check and replace more often if needed.
Replace or refresh carbon
Activated carbon loses capacity over time. If the unit has a separate carbon filter, replace it as recommended. If odour reduction drops before the stated life, consider changing it earlier.
Clean or replace pre-filters
Pre-filters catch larger dust and protect the HEPA. Vacuum or replace them as instructed so airflow stays good and HEPA life is maximised.
Keep inlets and outlets clear
Don’t block vents with furniture or curtains. Wipe the cabinet if dust builds up. Good airflow improves performance and can reduce strain on the motor.
Run consistently for best results
For allergies, dust and mould support, running the air purifier for long periods or continuously usually gives better results than short bursts. Use a timer or constant-on if the unit allows.
Standards and Safety: Air Purifiers in Australia
Electrical equipment used in Australian homes and workplaces must meet local safety standards. When you buy an air purifier in Australia, check that it is approved for Australian use (e.g. compliant with local electrical requirements). Thorair’s air purifiers and air scrubbers include options suitable for Australian conditions. For HEPA, prefer true HEPA (H13 or H14) over HEPA-type for particle removal.
- Choose air purifiers and electrical equipment that meet Australian electrical and safety standards.
- Check voltage and plug type (e.g. 240V) for Australian supply.
- For restoration and commercial use, ensure filters and replacements are available and correctly specified.
Where Air Purifiers Are Used
Homes and bedrooms
For allergies, dust, pet dander and general air quality. Running a HEPA air purifier in bedrooms and main living areas can help reduce particle exposure and improve comfort.
Living rooms and open plan
Larger or open-plan spaces often need a bigger unit or more than one. HEPA and carbon help with dust, allergens, cooking odours and outdoor pollutants that enter through windows.
Offices and workplaces
In offices, clinics and similar spaces, air purifiers can support air quality and reduce dust and allergens. Size for the room or zone and consider noise and run time.
Nurseries and kids’ rooms
Parents often use air purifiers in nurseries and children’s rooms for dust and allergens. Choose a quiet model and one with a safe, stable design. Keep units out of reach of small children.
Mould remediation
During and after mould removal, HEPA air scrubbers capture spores and fine dust. Use in the work area and, where needed, in containment. Pair with dehumidifiers for moisture control.
Water and fire restoration
In water damage and fire jobs, HEPA scrubbers clean the air of spores, soot and debris. Often used with dehumidifiers and air movers for drying and cleaning.
Schools and education
Classrooms and common areas can benefit from HEPA purifiers for dust and allergens. Size for the room and consider noise during lessons.
Smoking and odour control
For smoke and strong odours, use units with HEPA and a substantial carbon layer. In heavy or persistent cases, air scrubbers with carbon are often used in restoration and commercial settings.
Why Choose Thorair for Air Purifiers in Australia
Range for home and trade
Thorair supplies air purifiers and HEPA air scrubbers for home, office, restoration and commercial use. From portable room units to scrubbers for mould and water damage.
Expertise in air and moisture
We specialise in dehumidifiers, air movers, air scrubbers and restoration equipment. Our team can help you match an air purifier or scrubber to your room, concern and budget.
Australian-focused
Equipment suited to Australian conditions and electrical standards. Contact us on 1300 263 551 or info@thorair.com.au for sizing, product details and orders.
Free delivery over $2,000
Free delivery on orders over $2,000. Browse air purifiers and the Thorair air purifier, or combine with dehumidifiers and restoration gear for larger orders.
Related Solutions: Dehumidifiers and Restoration
For mould and damp, pair an air purifier or scrubber with a dehumidifier to control humidity and limit regrowth. For floods, leaks and fire, water damage restoration and fire cleanup use dehumidifiers, air movers and HEPA air scrubbers together. Thorair supplies dehumidifiers, restoration equipment and air purifiers for home and commercial use across Australia.
Air Purifier: Frequently Asked Questions
What is an air purifier?
An air purifier is a device that draws room air through filters (such as HEPA and activated carbon) to remove particles, and with carbon, some gases and odours. It recirculates filtered air in the space. Portable units treat one or a few rooms; air scrubbers and commercial systems treat larger or commercial spaces.
Do air purifiers work?
Yes. HEPA filters are proven to capture fine particles (pollen, dust, mould spores, many bacteria and some viruses). Carbon layers can reduce certain gases and odours. Results depend on filter quality, airflow, room size, run time and the type of pollutant. They work best with good ventilation and housekeeping.
What is the best air purifier for allergies?
Choose one with a true HEPA filter (H13 or H14), sized for your room. Run it in bedrooms and main living areas, especially when pollen or dust is high. Replace filters on schedule. Thorair’s air purifiers include HEPA models suitable for allergy and asthma support.
Is an air purifier good for mould?
HEPA air purifiers capture mould spores from the air, which helps during and after mould growth or remediation. They do not remove mould on surfaces—cleaning or remediation is still needed. For mould, use a HEPA purifier or scrubber and pair with dehumidification to control humidity.
Air purifier vs dehumidifier: which do I need?
Air purifiers filter particles (and with carbon, odours). Dehumidifiers lower humidity. For mould, use both: dehumidifiers address moisture; air purifiers address spores. For allergies and dust, an air purifier is the main tool. For damp, condensation and musty smells, a dehumidifier is. Shop dehumidifiers and air purifiers at Thorair.
What size air purifier do I need?
Match the unit’s stated coverage (m², m³ or CADR) to your room. For a bedroom, a unit rated for that size is usually enough. For living rooms and open plan, use a larger unit or more than one. In restoration, size scrubbers by room or zone and use ducting as needed. View our air purifiers and check each product’s coverage.
How long should I run an air purifier?
For allergies, dust and general air quality, running it for long periods or continuously often gives the best results. In bedrooms, overnight or 24/7 is common. Use the highest practical speed when you want faster cleaning, and a lower speed or sleep mode when noise matters.
When should I replace air purifier filters?
Follow the manufacturer’s schedule for HEPA and carbon. Many HEPA filters are replaced every 6–12 months; carbon may be 3–6 months or as stated. In very dusty or high-use situations, replace more often. Clogged filters reduce airflow and performance.
What is HEPA in an air purifier?
HEPA (High Efficiency Particulate Air) is a filter that captures at least 99.97% of particles at 0.3 microns—including pollen, spores, dust, many bacteria and some viruses. True HEPA meets defined tests; "HEPA-type" is usually less strict. For particles, choose true HEPA (e.g. H13 or H14).
Can an air purifier help with smoke?
HEPA filters capture smoke particles. Activated carbon helps with smoke odours and some gases. For tobacco, cooking or fire, choose a unit with HEPA and a real carbon layer. For heavy smoke or fire restoration, HEPA air scrubbers with carbon are typically used.
Where can I buy an air purifier in Australia?
Thorair sells air purifiers and the Thorair air purifier for home and commercial use. We also supply HEPA air scrubbers for restoration and mould. Shop at thorair.com.au, or call 1300 263 551 or email info@thorair.com.au. Free delivery on orders over $2,000.
What is the difference between an air purifier and an air scrubber?
Room air purifiers are for one or a few rooms and general home/office use. Air scrubbers are larger, move more air and are used in restoration, mould work and construction. Many have HEPA and carbon and ports for ducting. Both use HEPA; scrubbers are for bigger, noisier, trade-style jobs. View air scrubbers at Thorair.
Shop Air Purifiers at Thorair
HEPA air purifiers for home, office and nursery. Air scrubbers for restoration and mould. View the Thorair air purifier or speak to our team on 1300 263 551 or info@thorair.com.au. Free delivery on orders over $2,000.
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