HEPA Rating
- H11-H12: High-efficiency grade, filters 90%–99.5% of 0.3-micron particles, suitable for everyday household use.
- H13-H14: Medical grade, filtration efficiency reaches 99.95%–99.995%, suitable for allergy sufferers, asthma patients, or areas with severe air pollution.
Composite Filter Structure
- HEPA + Activated Carbon: Activated carbon adsorbs odors, formaldehyde, and other gaseous pollutants, suitable for newly renovated homes or homes with pets.
- HEPA + Antibacterial Layer: Added antibacterial coating (such as silver ions, lysozyme) inhibits the growth of bacteria and mold.
- HEPA + Electrostatic Electret: Enhances electrostatic adsorption capacity, but note that the electrostatic charge on some filters may decrease over time.
Key Parameters
- CADR Value (Clean Air Delivery Rate): Filter performance affects the CADR value; after replacement, it should not be lower than the original manufacturer’s rated value.
- Dust Capacity: Determines filter lifespan; higher dust capacity means a longer replacement cycle.
- Initial Resistance: Lower resistance results in lower operating noise and energy consumption.
Usage Scenarios
- Daily Dust Removal/Pollen Allergies: H11-H12 grade is sufficient; use a pre-filter to extend lifespan.
- Pet-Friendly Families: Choose an allergen-resistant HEPA filter combined with activated carbon for odor removal.
- Formaldehyde/Odor Issues: Choose a high-iodine-value activated carbon composite filter, or a model specifically designed for formaldehyde removal (e.g., with added photocatalysis).
- Humid Areas: Choose a filter with an anti-mold coating to prevent bacterial growth.
Filter Lifespan and Replacement Costs
- Replacement Cycle: Typically 6–12 months, depending on usage frequency and air quality.
- Smart Reminder Function: Some high-end purifiers have filter replacement indicator lights.
- Long-Term Costs: Calculate annual filter costs to avoid the situation of “affording the purifier but not the filter.”
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