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Filters in AHUs and FCUs serve several key functions:

• Improve Indoor Air Quality (IAQ) by trapping dust, pollen, mold spores, and bacteria

• Protect HVAC components like coils and fans from dirt buildup

• Enhance energy efficiency by maintaining proper airflow

• Extend equipment lifespan through reduced wear and tear

Recommended Filter Replacement Frequency

The frequency of filter changes depends on the filter type, environment, and usage intensity:

Filter Type	Replacement Frequency (Typical)
Panel Filters	Every 1–2 months
Pleated Filters	Every 2–3 months
Bag Filters	Every 6–12 months (depending on load)
HEPA Filters	Every 12–24 months (or based on pressure drop)
Carbon Filters	Every 3–6 months

Tip: Use a differential pressure gauge to monitor filter loading. When the pressure drop doubles from its initial value, it’s time to replace the filter.

If you’re managing a facility or planning maintenance schedules, KCK-SS can help you build a filter replacement log or even optimize your HVAC system for energy savings. Want to go deeper into MERV ratings or filter selection for specific environments. Contact us!