Filter Handling, Storage, Maintenance and Replacement SOP

Handling and Storage

• Handle filter cartons gently at all times.

• Keep cartons upright as marked with ‘This Side Up’.

• Store in a clean, dry indoor area—away from direct sunlight and moisture.

• Maintain storage conditions below 45°C temperature and 70% relative humidity to prevent media degradation.

• Stack cartons only on clean, flat surfaces—do not stack more than 3 boxes high.

• Do not place heavy items on cartons or stand/sit on them.

• Avoid dropping or dragging boxes—filters are delicate.

• Follow FIFO (First In, First Out) principle to ensure shelf-life compliance.

• Avoid storage in open or chemical exposure zones.

Installation

• Inspect the installation site and filter holding frame before starting.

• Confirm the correct filter type and airflow direction before placement.

• Install gently—do not bend, squeeze, or damage the filter media.

• Tighten locking clips or gaskets uniformly to prevent leakages.

• Ensure gasket forms a proper seal to eliminate bypass air.

Cleaning & Maintenance

(Pre and Fine Filters Only)

• Use a manometer or magnehelic gauge to check pressure drop before cleaning.

• Remove filters carefully and shift to a clean maintenance area.

• Clean using compressed air (≤2 bar) from the clean air side to dislodge dust.

• If washable:

  • Use mild detergent and rinse with clean water.

  • Dry filters in a shaded, clean environment (max 45°C) for 1–2 hours.

• Do not reuse filters until they are fully dry and confirmed free of damage.

Cleaning Frequency

Always prioritize pressure drop as the primary indicator for cleaning frequency.

HEPA and Minipleat Filters – Do Not Clean

• Do not wash, clean, or repair HEPA filters.

• Replace immediately if pressure drop exceeds the final limit or if the filter fails integrity (DOP) tests.

• During inspection:

  • Check for side leaks—replace gaskets/seals using approved silicone if required.

  • Do not disturb the media or pleats.

Filter Replacement Guidelines

• Always perform replacements during non-operational hours.

• Use only compatible filters as per the system specification.

Disposal / Scrappage

• Do not reuse failed HEPA filters—scrap immediately.

• Dispose of used pre- and fine filters in a safe, contamination-free manner.

• Follow local environmental and safety guidelines for disposal of used or contaminated filters.