ISO CLASS 5 / DIN 1946 COMPLIANT

Laminar Air Flow (LAF) & Cleanroom HVAC

Ultra-clean vertical unidirectional laminar airflow plenums with terminal H14 HEPA filtration (99.997% @ 0.3μ). Delivering positive pressure sterile envelopes that prevent surgical site infections.

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SURGICAL SITE INFECTION DEFENSE

Unidirectional Sterile Air Envelope Over The Operating Field

Clean air is the primary surgical weapon against airborne bacterial contamination and Surgical Site Infections (SSI). At United Services, our Laminar Air Flow (LAF) ceilings and dedicated Cleanroom HVAC systems adhere to the rigorous guidelines of DIN 1946-4, ISO 14644-1, and NABH operating theatre recommendations.

Our LAF plenums deliver an ultra-pure vertical column of conditioned air directly over the patient table at a controlled velocity of 0.25 to 0.38 m/s. This piston-like air displacement sweeps airborne squames, microbes, and surgical plumes downward and outward toward low-level wall exhaust grilles, ensuring that the sterile surgical field remains pristine throughout lengthy procedures.

99.997% Filtration
Terminal EU14 / H14 certified minipleat HEPA filters
+15 to +25 Pa
Positive pressure cascade preventing corridor ingress
United Services Laminar Air Flow Ceiling Plenum Actual Photo
ACTUAL COMMISSIONED INSTALLATION
SS 304 LAF Clean Air Ceiling with Surgical Light Collar
CLEAN AIR SUBSYSTEMS

Integrated Cleanroom HVAC Scope of Supply

From central Air Handling Units (AHU) to micro-mesh diffusion ceilings and ductwork.

01

SS 304 LAF Ceiling Plenums

Full stainless steel 304 grade airtight supply plenum box fitted with fluid-seal or gasket-seal knife edges, PAO aerosol test ports, and differential pressure gauges.

02

H14 Minipleat HEPA Filters

Certified H14 HEPA filters delivering 99.997% collection efficiency at 0.3 micron. Individually factory-scanned and certified for zero media pinhole leakage.

03

Micro-Mesh Diffusion Screen

Perforated micro-mesh or woven monofilament polyester diffuser fabric generating uniform laminar airflow velocity with zero air turbulence or dead recirculation pockets.

04

Dedicated Cleanroom AHUs

Double-skin Air Handling Units with thermal-break aluminum profiles, plug fans with VFD modulation, EU4 pre-filters, and EU8 intermediate micro-filters.

05

Temperature & Humidity Precision

Maintains strict 18°C - 21°C room temperature and 45% - 55% relative humidity via modulating reheat coils and steam humidifiers to inhibit bacterial proliferation.

06

OT Light Integration Spindle

Specially engineered central airtight mounting collar allowing single or dual-arm surgical OT lights to pass through the ceiling plenum without air bypass leaks.

STANDARDS & PARAMETERS

Laminar Flow & HVAC Engineering Standards

Exhaustive design parameters ensuring full NABH and DIN 1946 accreditation compliance.

HVAC Parameter United Services Standard Regulatory Standard
Air Cleanliness Class ISO 14644-1 Class 5 / US Fed Std 209E Class 100 ≤ 3,520 particles/m³ @ ≥ 0.5 μm
Terminal HEPA Filtration EN 1822 Grade H14 (99.997% @ MPPS 0.3 micron) PAO / DOP leak scan tested on site
Air Velocity Under Plenum 0.25 to 0.38 m/s (50 to 75 FPM) unidirectional DIN 1946-4 Section 6 Guidelines
Air Changes Per Hour (ACPH) 25 to 30 Air Changes Per Hour (min. 5 outdoor fresh air) NABH Operating Theatre Standards
Positive Pressure Gradient +15 to +25 Pascal relative to corridor Prevents ingress of dirty corridor air
Acoustic Noise Criterion ≤ 48 - 52 dBA within surgical zone Attenuators fitted inside supply ducts

Ensure Flawless Air Quality For Your Surgical Team

Connect with Technical Director Rishikesh Sawant (+91 93228 65545) or Engineering Lead Deepak Sawant (+91 90041 17086) for CFM sizing calculations, AHU layout schematics, and cleanroom validation services.

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