When people talk about “better air,” they often mean different problems: dust on surfaces, allergy triggers, wildfire smoke, or stubborn cooking odors. The truth is that no single filter solves everything. In a ventilation system, each filter class has a specific job, and real air-quality gains come from matching the filter to the pollutant. G4 is a coarse pre-filter. It mainly captures large particles such as lint, hair, and visible dust. On its own, it won’t dramatically reduce allergens or smoke, but it protects the fan and heat exchanger, keeps ducts cleaner, and extends the life of finer filters. F7 is a fine filter that makes a noticeable difference for everyday comfort. It captures smaller particles linked to allergies—pollen, many mold spores, and traffic-related particulate. For many Oxnard homes, an F7 stage is the best balance of filtration, airflow, and operating cost. HEPA is for the highest particle control. It targets very small particles, including fine smoke and airborne dust that can irritate lungs. HEPA can greatly improve air quality, but it usually increases resistance and may require a properly sized ventilation unit to maintain airflow. Carbon (activated charcoal) is different: it’s for gases, odors, and many VOCs—not dust. It can reduce cooking smells and some chemical pollutants, but performance depends on carbon mass and contact time. Thin “carbon-coated” pads help a little; deep carbon beds work far better. Best practice is layered filtration: G4 + F7 for most homes, and add HEPA or a substantial carbon stage when smoke events, sensitivities, or odor/VOC issues are the priority.
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