Ryco RCA183M N99 MicroShield Cabin Air Filter – Subaru Forester, Impreza, WRX STI & XV
Cleaner Air Inside Your Subaru
The Ryco RCA183M N99 MicroShield Cabin Air Filter is designed to reduce the dust, pollen, fine particles, traffic pollution and unpleasant odours entering your Subaru through its heating and ventilation system.
Its three-layer construction provides more comprehensive filtration than a basic particulate cabin filter, making it a worthwhile upgrade for everyday driving, urban traffic and anyone affected by pollen, dust or outside smells.
N99 MicroShield Filtration
Ryco rates its N99 MicroShield media at:
99.7% filtration efficiency at 0.3 microns, tested to ISO 11155-2:2009
Particles around this size can remain suspended in the air and pass more deeply into the respiratory system than larger, visible dust particles.
The RCA183M is designed to capture or reduce:
- Fine dust
- Pollen
- Soot and smog particles
- Mould and fungal spores
- Selected airborne bacteria
- Selected airborne viruses
- Traffic-related odours
- Smoke and other unpleasant smells
Three-Layer Construction
Each layer within the RCA183M performs a different role.
Anti-Viral and Anti-Bacterial Pre-Filter
The first layer captures larger airborne particles and incorporates anti-viral and anti-bacterial agents.
These agents are designed to act on selected microorganisms captured within the filter media while helping prevent bacterial growth inside the filter.
Ryco’s anti-viral testing references H1N1 and H3N2 influenza strains.
Activated-Carbon Odour Barrier
The activated-carbon layer helps reduce:
- Exhaust smells
- Traffic-related odours
- Fuel vapours
- Smoke
- General unpleasant smells
- Some gaseous contaminants entering through the ventilation system
It provides a noticeable advantage over a conventional pollen filter, particularly when driving in traffic or following diesel vehicles.
Electrostatically Charged Particle Layer
The final layer uses electrostatically charged media to attract and retain extremely small airborne particles.
This allows the filter to capture fine contamination while maintaining the airflow required by the vehicle’s heater and air-conditioning system.
Ideal for Hay Fever and Allergy Sufferers
A conventional cabin filter may stop larger dust and debris but allow much finer contamination to pass through.
The RCA183M provides additional protection against pollen and fine particles that may aggravate:
- Hay fever
- Seasonal allergies
- Asthma symptoms
- Dust sensitivity
- Sensitivity to traffic pollution
- Irritation caused by poor outside air quality
The filter is designed to reduce the concentration of these contaminants entering through the ventilation system. It is not a medical device and cannot guarantee protection against illness, allergic reactions or infection.
Subaru Application Summary
The RCA183M is listed for selected Subaru vehicles using the corresponding cabin-filter housing.
Subaru Forester
Including selected:
- SH5
- SH9
- SHH
- SHD
- SHN
- SHJ
- SHM
- SJ9
Approximate catalogue coverage ranges from 2008 to 2018, depending on chassis and market.
Subaru Impreza
Including selected:
- GE3
- GE7
- GJ3
- GP7
- GR and GV performance models
- Selected later Impreza applications using the same HVAC housing
Approximate catalogue coverage begins from 2008, depending on chassis and market.
Subaru WRX and WRX STI
Including selected:
- 2008 to 2013 WRX STI
- Selected WRX models
- VA and VAB-generation WRX STI applications
Fitment must be confirmed by chassis and cabin-filter housing, particularly on imported vehicles.
Subaru XV
Including selected:
- GP7 2.0
- Approximate catalogue coverage from 2012 to 2017
Ryco includes RCA183M in its RSK85C service kit for the GP7 Subaru XV.
Important Fitment Information
Cabin-filter compatibility is determined by the vehicle’s chassis and HVAC housing rather than its engine code.
The supplied application catalogue contains global fitments and several old open-ended records displayed as continuing to 2025. This does not mean that every Subaru carrying the same model name up to 2025 uses this filter.
Before ordering, confirm:
- Vehicle model
- Chassis generation
- Existing filter shape
- Cabin-filter housing
- Vehicle market
If you are unsure, please contact us with your registration number, VIN or a photograph of the existing filter before ordering.
Technical Specifications
- Manufacturer: Ryco
- Product range: N99 MicroShield
- Manufacturer part number: RCA183M
- Filter type: Bio-functional cabin air filter
- Filtration rating: 99.7% efficiency at 0.3 microns
- Test standard: ISO 11155-2:2009
- Filtration layers: Three
- Anti-viral media: Yes
- Anti-bacterial media: Yes
- Activated-carbon layer: Yes
- Electrostatically charged layer: Yes
- Flame-retardant media: Yes
- Installation location: Passenger side, behind the glovebox
- Estimated installation time: Approximately 15 minutes
- Product weight: Approximately 0.24kg
What’s Included
- 1 x Ryco RCA183M N99 MicroShield cabin air filter
No tools or additional servicing components are included unless specifically stated otherwise.
Recommended Replacement Interval
Ryco recommends replacing its cabin air filters:
- Every 15,000km
- Once every 12 months
- Whichever occurs first
More frequent replacement may be required when the vehicle is regularly used in:
- Heavy urban traffic
- Dusty environments
- Agricultural areas
- Areas with high pollen levels
- Vehicles regularly carrying pets
- Cars where the ventilation system is used heavily
The filter should also be replaced if it becomes visibly dirty, damaged or contaminated.
Signs the Cabin Filter Needs Replacing
Common signs include:
- Reduced airflow from the vents
- Persistent musty smells
- Windows taking longer to demist
- Increased dust inside the cabin
- Greater irritation from pollen
- Increased ventilation-fan noise
- Visible dirt and debris on the existing filter
A heavily blocked cabin filter can restrict airflow through both the heater and air-conditioning system.
Installation
The RCA183M is installed behind the passenger-side glovebox on applicable vehicles.
General installation involves:
- Emptying and lowering the glovebox.
- Removing the cabin-filter access cover.
- Checking the airflow direction marked on the existing filter.
- Removing the old filter without dropping debris into the fan housing.
- Cleaning loose debris from the accessible filter compartment.
- Installing the new filter in the correct airflow direction.
- Refitting the access cover and glovebox.
Exact access arrangements may differ between Subaru models.
Why Choose N99 MicroShield?
Because a standard cabin filter may catch visible dust while allowing much finer particles and unpleasant odours to pass through.
Because activated carbon helps make the cabin more pleasant when driving through traffic.
And because the RCA183M combines particle, odour and biological filtration within one direct-replacement cabin filter.
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