1. Product Overview
This air conditioning filter set is designed as a replacement for various HITACHI RAS and RAC series air conditioner models. The set includes two filters of different dimensions to ensure comprehensive compatibility and effective air purification within your unit. Regular replacement and maintenance of air filters are crucial for maintaining indoor air quality and the efficiency of your air conditioning system.
Compatible Models:
- RAS-a32BH
- RAS-a35JH
- RAC-a35JC
- RAS-b32BH
- RAS-b35JC
- RAS-b35JH
- RAS-G32BH
- RAS-S32BH
- RAS-S35JH
- RAS-A32DH
- RAS-B32DH
- RAS-C35JH
- RAS-D35JH
- RAS-A33AH
- RAS-A35LH
2. Specifications
| Feature | Detail |
|---|---|
| Material | Plastic |
| Type | Air Conditioning Filter |
| Origin | Mainland China |
| Large Filter Dimensions | 34.5 cm (Width) x 33 cm (Height) |
| Small Filter Dimensions | 27.4 cm (Width) x 33 cm (Height) |



3. Setup and Installation
Follow these steps to install your new air conditioning filter set:
- Safety First: Before attempting any installation or maintenance, ensure your air conditioning unit is completely turned off and disconnected from its power source to prevent electrical hazards.
- Locate Filter Slot: Open the front panel of your indoor air conditioning unit. The filter slots are typically located behind this panel.
- Remove Old Filters: Carefully slide out the old air filters. Note their orientation to ensure correct installation of the new filters.
- Clean Filter Area (Optional but Recommended): Gently wipe down any dust or debris from the filter housing area before inserting the new filters.
- Insert New Filters: Identify the correct filter for each slot based on the dimensions (34.5cm x 33cm for the larger slot, 27.4cm x 33cm for the smaller slot). Slide the new filters into their respective slots, ensuring they are fully seated and oriented correctly (e.g., airflow direction arrows, if present, should point towards the unit).
- Close Unit: Close the front panel of your air conditioning unit securely.
- Restore Power: Reconnect the power to your air conditioning unit.
4. Operating Instructions
Once installed, the air filters operate passively as part of your air conditioning system. They are designed to capture dust, pollen, and other airborne particles as air passes through them, improving the air quality in your space. The filters function whenever your air conditioning unit is running in any mode (cooling, heating, or fan-only).
5. Maintenance
Regular maintenance of your air filters is essential for optimal performance and air quality.
- Inspection: Inspect the filters monthly for visible dirt and dust buildup.
- Cleaning: These filters are typically washable. Gently rinse them under cool, running water to remove accumulated dust. Avoid using harsh detergents or abrasive brushes, as this can damage the filter material.
- Drying: Allow the filters to air dry completely in a shaded, well-ventilated area before re-installing them. Do not expose them to direct sunlight or use heat to dry them, as this can warp the plastic frame or damage the filter media.
- Replacement: While washable, filters have a finite lifespan. It is recommended to replace your air filters every 3 to 6 months, or more frequently if you live in a dusty environment, have pets, or suffer from allergies.
6. Troubleshooting
If you experience issues after installing new filters, consider the following:
- Reduced Airflow: Ensure the filters are installed correctly and are not obstructed. If the filters are dirty, clean or replace them.
- Unusual Odors: If new odors appear, ensure the filters were completely dry before re-installation. If odors persist, the issue may be with the AC unit itself, requiring professional inspection.
- AC Not Cooling/Heating Effectively: While filters primarily affect air quality, severely clogged filters can restrict airflow and reduce the efficiency of your AC unit. Ensure filters are clean and properly installed.
- Filter Doesn't Fit: Double-check the dimensions of your air conditioner's filter slots against the provided filter dimensions (34.5cm x 33cm and 27.4cm x 33cm) and ensure your model is listed as compatible.
7. User Tips
- Regular Cleaning Schedule: Set a reminder to clean your filters monthly. A clean filter not only improves air quality but also helps your AC unit run more efficiently, potentially saving energy.
- Stock Up: Consider having a spare set of filters on hand so you can replace them immediately when needed, minimizing downtime for your AC unit.
- Check for Damage: Before installing, always inspect new filters for any damage to the frame or mesh that might have occurred during shipping.
8. Warranty and Support
For specific warranty information regarding this air filter set, please refer to the seller's terms at the time of purchase or contact the manufacturer directly. For technical support or further assistance with your HITACHI air conditioning unit, please consult your air conditioner's original manual or contact HITACHI customer service.





