Indoor air quality depends not only on ventilation volume, but on the right filtration chain. Marketing often makes every filter sound “universal”, yet each class solves a specific problem: particles, allergens, smoke, or odors. G4 is a coarse pre-filter. Its main job is to catch large dust, insects and lint, protecting fans and heat exchangers and extending the life of finer stages. G4 alone won’t noticeably reduce PM2.5 or allergy symptoms, but it is a practical first barrier in most ventilation units. F7 (fine filter) is where air quality changes become noticeable. It is designed to capture much smaller particles, including a large share of urban dust and pollen. In many homes and apartments, an F7 stage provides a strong balance between filtration and airflow, making it a common “daily driver” for cleaner air. HEPA is the next step for maximum particle removal. It targets very fine aerosols and is often chosen for allergy sufferers, smoke-sensitive users, or rooms where cleanliness is critical. Keep in mind: HEPA increases resistance, so the ventilation unit must be sized correctly; otherwise airflow drops and noise may rise. Activated carbon is different: it does not remove dust efficiently, but it adsorbs gases—odors, some VOCs and certain pollution compounds. Carbon works best as an add-on after particle filtration; otherwise dust clogs it quickly. Its effectiveness depends on carbon volume, contact time, and timely replacement. A realistic, high-performance setup for many Fontana ventilation applications is G4 + F7, with optional HEPA for sensitive users and optional carbon for odor and gas control. The best filter is the one matched to your goals, airflow needs, and replacement schedule.
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