What is an Air Purifier Filter? Structure, Function & How to Choose the Right One

1. Overview

The air purifier filter is a crucial component that enables the device to remove dust, bacteria, pollen, and other air pollutants. Depending on the product line, an air purifier may utilize one or multiple filter layers, each serving a distinct role to deliver clean, healthy air.

2. Common Types of Air Purifier Filters

🔹 Pre-Filter
Function: Captures large particles such as dust, pet hair, and pollen.

• Washable and reusable.

• Usually the first layer in the filtration system.

🔹 HEPA Filter (High Efficiency Particulate Air Filter)
Function: Removes fine dust (PM2.5), bacteria, viruses, mold spores, and ultra-fine particles ≥ 0.3 microns with an efficiency of up to 99.97%.

• The most important filter in any air purification system.

🔹 Activated Carbon Filter
Function: Eliminates odors, cigarette smoke, moldy smells, and absorbs harmful gases like formaldehyde, benzene, and VOCs.

• Not washable, must be replaced periodically.

🔹 Cold Catalyst Filter
Function: Breaks down volatile organic compounds (VOCs) and toxic gases.

• Often combined with activated carbon for enhanced purification.

🔹 Ionizer/UV/Antibacterial Filters
Depending on the model, additional features such as negative ion generators, UV light, or nano-silver coating may be included for sterilization.

3. Filter Designs & Popular Shapes

Air purifier filters commonly come in two main designs:

✅ Cylindrical (360-degree):

• Common in tower-shaped air purifiers like Xiaomi or Sharp.

• Allows air intake from all directions for higher efficiency.

✅ Square/Rectangular:

• Found in models from Daikin, Hitachi, Panasonic, etc.

• Easy to remove, clean, and replace.

4. When to Replace an Air Purifier Filter?

• HEPA Filter: Every 6–12 months, depending on pollution level and usage frequency.

• Activated Carbon Filter: Approximately every 6 months.

• Pre-Filter: Clean monthly (reusable).

📌 If you notice reduced filtration performance, strange odors, or increased noise, check and replace the filter immediately.

5. How to Choose the Right Air Purifier Filter

🔍 Check the device model: Select the correct filter type based on the product code.
📏 Ensure compatibility: The filter must fit perfectly to prevent air leakage.
⭐ Select the proper HEPA grade (H11, H12, H13...) based on your air quality needs.
🔄 Prefer genuine filters or trusted third-party alternatives for maximum performance.

6. Contact Us for Filter Consultation & Purchase

BACH LONG PRODUCTION TRADING SERVICES COMPANY LIMITED
Address: 75 Nguyen Hong Street, Ward 1, Go Vap District, Ho Chi Minh City
Hotline: 093 143 54 54
Email: sales@congnghelockhi.vn
Website: www.congnghelockhi.vn

➡ Contact us now for free consultation, quick pricing, and the right air purifier filter tailored to your device!