Laminar Flow Ceiling Converts Standard Operating Theatre Into Verified ISO 5 Surgical Zone With H14 Filters

Most surgical site infections are airborne before they are contact-borne. A laminar flow ceiling placed directly over the operating table delivers a unidirectional curtain of H14 filtered air at 0.45 m/s, diluting and sweeping bacteria away from the open wound. YANING supplies the full assembly: plenum, HEPA filter bank, diffuser screen, LED surgical lighting ring and the control package that keeps the zone stable.

1. Ceiling plenum - 600mm deep static pressure box in 1.0mm galvanised steel, powder coated, sealed with continuous gasket
2. Filter bank - H14 HEPA filters, 99.99% at 0.3 micron, individually leak tested with PAO before shipment
3. Diffuser screen - woven stainless mesh with 85% open area for even velocity across the whole surgical field
4. Return path - low level wall grilles on two opposite sides create a clean-to-dirty sweep instead of turbulence
5. Controls - differential pressure transmitter, velocity sensor and alarm tied to the theatre BMS

For existing theatres the ceiling can be installed in a weekend shutdown: the old ceiling grid is removed, the plenum hung from the structural slab through threaded rods, and the filter bank commissioned before Monday cases begin. For new builds the ceiling is designed together with the modular enclosure so that lighting, gas pendants and the laminar field share one structural plane without clashes.

Three details decide whether a laminar ceiling actually works. First, the return air path: without low level returns positioned opposite each other, the clean curtain curls and the wound zone loses protection. Second, the filter bank gap: a 2mm gap between adjacent HEPA filters can drop zone cleanliness by a whole class. Third, the control logic: an alarm that only sounds at the panel is useless if nobody is in the plant room, so we wire it to the theatre display.

Share your theatre ceiling height, table position and available plant room space, and we will size the plenum and return grilles for your room.