1. Four Core Selection Principles: Grade Adaptation, Air Volume Matching, Working‑Condition Compatibility and Dimension Compliance

1. Cleanliness‑grade adaptation: Match filter modules and equipment types against designed clean‑room classification. For ISO 5 (Class 100) ultra‑high‑grade cleanrooms, adopt gel‑sealed air‑supply ceiling diffuser with H14 HEPA filter. For ISO 6 (Class 1 000) cleanrooms, select gel‑sealed or premium paper‑separator diffuser with H13 HEPA filter. For ISO 7 (Class 10 000) cleanrooms, deploy conventional integrated air‑supply ceiling diffuser fitted with H13 HEPA filter.

2. Air‑volume parameter matching: Calculate total required air volume based on workshop area and air‑change rate, then determine the quantity of diffusers and rated air volume of each unit. Ensure sufficient air‑change rate and adequate air‑supply margin, avoiding insufficient or excessive air supply.

3. Working‑condition adaptation: SUS304 stainless‑steel antibacterial type for aseptic pharmaceutical and high‑humidity corrosive environments; painted galvanized‑steel type for general‑purpose industrial clean‑room conditions; high‑temperature‑resistant filter modules for high‑temperature scenarios.

4. Dimension specification adaptation: Choose standard or customized dimensions according to ceiling size and layout to achieve orderly arrangement and uniform air distribution.

2. Standardized Installation Workflow: Pre‑Preparation, Lifting & Fixing, Duct Connection & Sealing, Module Assembly

1. Pre‑preparation: Verify equipment specifications and visual integrity; clear ceiling installation zone; reserve duct interfaces and maintenance access openings; implement dust‑proof protection for construction activities.

2. Lifting and fixing: Secure units with dedicated suspension lead screws, calibrate levelness with allowable deviation ≤ 1 mm/m. Ensure firm installation without inclination or shaking and neat overall layout.

3. Air‑duct connection: Precisely align supply‑air duct with unit air‑inlet. Apply flexible joints for vibration damping and noise reduction to eliminate air leakage risk. Seal joints thoroughly with zero gaps.

4. Module assembly: Mount HEPA filters, flow‑equalizing membranes and protective grilles sequentially. Guarantee tight fitting without compression stress; achieve complete filter sealing; keep flow‑equalizing membranes wrinkle‑free and undamaged.

3. System Commissioning after Installation Completion: Air‑Pressure, Air‑Velocity and Airflow‑Uniformity Tuning

Start supply‑air system under low‑speed mode, gradually ramp up air volume to rated operating condition and stabilize plenum chamber pressure for uniform pressure distribution. Measure air velocity at multiple workshop locations with an anemometer and adjust system air volume to keep velocity within standard range of 0.3‑0.5 m/s. Perform multi‑point testing for airflow uniformity, ensuring velocity deviation ≤ 10 % across measuring points; eliminate local eddy currents and airflow dead zones.

4. Core Acceptance Criteria

1. Airtightness: Zero air leakage and hidden contamination risk.

2. Air‑velocity uniformity: Uniform air supply throughout the zone without dead corners or turbulence.

3. Filtration performance: Pass PAO filter integrity test; airborne particle concentration meets designed cleanliness classification.

4. Operational stability: Free of abnormal noise; stable air pressure without air‑volume decay.

Formal commissioning is permitted only after all acceptance indicators pass. Appropriate selection, standardized installation and precise commissioning maximize uniform‑air‑supply performance of ceiling diffusers and support long‑term stable compliance of clean‑room environment.