Step 1: Confirm on-site working conditions (the primary step of selection)

1. Year-round operating temperature, confirm the maximum continuous working temperature, which shall not exceed 80℃.
2. System operating relative humidity, check whether there is seasonal humidity fluctuation, condensation risk.
3. Room disinfection method: whether VHP hydrogen peroxide fumigation or steam spray disinfection is adopted. Paper separators are not recommended if regular VHP fumigation is applied.
4. Cleanliness class of downstream area, whether zero tolerance for foreign debris is required.
5. Installation position: inside air handling unit or ceiling air supply plenum; check if condensation may occur inside the cabinet.

Step 2: Judge whether paper separator solution is applicable ✅ Applicable scenarios for paper separator: Workshop ambient temperature ≤80℃; stable relative humidity ≤85% RH; no condensation; no VHP / steam fumigation; dry operating environment.

❌ Scenarios where paper separator is prohibited, switch to aluminum foil separator: With condensation risk; adopting VHP hydrogen peroxide fumigation; long-term humidity＞85% RH; working temperature＞80℃; high-risk GMP areas of Grade A/B; biosafety laboratories.

Step3: Structural parameter selection

1. Filtration efficiency class H13: ISO7~8 cleanrooms, electronic factories, ordinary packaging workshops for most conventional projects. H14: High-grade dry cleanrooms, dry production areas with strict particulate control requirements.
2. Frame material Galvanized steel sheet: dry indoor environment, cost priority. Aluminum alloy: for environments with humidity fluctuation and coastal salt spray, preferred for better corrosion resistance.
3. Structural form: non-flange, single flange, double flange, matching the installation interface of air supply plenum; common thickness: 150mm, 220mm, 292mm.
4. Mandatory requirement for separator material: double-sided impregnated board paper separator, ordinary corrugated paper separator is not acceptable. The separator material shall be specified in the technical specification to avoid low-quality products.

Industry-specific selection summary

1. Electronic manufacturing industry Ordinary electronics, PCB, optical dry clean workshops: paper separator HEPA filters are preferred, mainly H13 class, galvanized steel / aluminum alloy frame. Humidity control shall be well maintained to avoid condensation inside the cabinet. Switch to aluminum foil separator if workshop humidity is high.
2. Food industry Dry packaging workshops without steam spray: paper separator is acceptable. For cooking, cleaning and high-humidity production areas, aluminum foil separator is mandatory.
3. Hospital Ordinary clean wards and dry ventilation terminals can adopt paper separator. Operating rooms, isolation wards and areas with frequent spray disinfection are recommended to use aluminum foil separator.
4. Pharmaceutical industry Paper separator can be used in non-sterile auxiliary dry areas without VHP fumigation and controllable humidity. Aluminum foil separator HEPA filters must be adopted and paper separator is prohibited in sterile Grade A/B/C areas and rooms with VHP disinfection.

Key clauses for procurement technical specification, can be directly added to bidding documents

1. Filter type: deep-pleat separator HEPA filter, separator made of double-sided impregnated board paper, ordinary corrugated paper separator is forbidden.
2. Implementation standard: EN1822-1, tested by MPPS method, single unit test report available.
3. Operating condition: continuous working temperature ≤80℃, operating relative humidity ≤85% RH, no condensation, not applicable for VHP fumigation environment.
4. Frame material: galvanized steel sheet / aluminum alloy (optional); polyurethane sealant with continuous full bead without air bubbles.
5. Factory inspection: each unit passes resistance test and PAO scan leak test.
6. Final resistance: 450Pa, replace filter when reaching final resistance.

Common misconceptions in selection Misconception 1: Only focus on filtration efficiency while ignoring temperature and humidity limits, applying paper separator filters in GMP rooms with VHP fumigation. Misconception 2: No constraint on separator material; low-budget projects adopt ordinary corrugated paper separators, causing continuous paper debris shedding under normal operating conditions. Misconception3: Neglect condensation risk inside air handling unit. Condensed water dripping onto filters leads to failure of paper separators. Misconception4: Assume occasional excessive humidity has no impact; paper separator damage caused by water absorption is irreversible.

bacclean paper separator HEPA filters adopt double-sided impregnated board paper separators, with complete efficiency grades from H10 to H14, optional galvanized steel and aluminum alloy frames, and leak test for every unit. bacclean also supplies aluminum foil separator HEPA filters as alternative selection for high-humidity and VHP fumigation environments.