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IUSS: Hospital Theatres
Transcript of IUSS: Hospital Theatres
Concepts Cleanroom Standards ISO 14644 Part 1: Classification of air cleanliness Part 2: Specifications for testing and monitoring to prove continued compliance with ISO 14644-1
Part 3: Metrology and test methods
Part 4: Design, construction and start-up
Part 5: Operations
Part 4: Design, construction
and start-up Annex A: Contamination Control
Methods Barrier Concept: Aerodynamic Effects: 1) Displacement Concept 2) Pressure differential concept High Pressure / Low Airflow Low Pressure / High Airflow High Pressure / Low Airflow
Part 3: Test Methods Cleanroom Concepts Part2: Specifications for testing and monitoring to prove continued compliance with ISO 14644-1 Part1: Classification of air cleanliness 3) Dilution (not described
in ISO 14644-4) Airborne Contamination Control Strategies SG = LOG (Cx/Cref) Standards Ventilation Rates ASHRAE vs NBR vs ISO14644 Considerations for
UDAF Design Filtration Course Filters EN, MERV or
SANS 1424:2008? SANS 1424 refers to EN779 for filter classification Fine Filters Aerosol Filters (HEPA) Importance of Pressure Cascading Quantifying
Protection Levels At 3m ceiling height
Excluding UDAF (LAF) air DIN 1946/4 - 2008 } E10-E12 Importance of
Pressure Cascading Room air change rates cannot be calculated with
contaminated air quantities.
(ie - UDAF or Infiltration air) Therefore use SANS1424 for course and fine filter classification and EN1822 for HEPA filter classification Design for "In-Operation"
Establishment Time Memarzadeh et al - 2004 "At Rest" Conditions do not reflect real performance Most guidelines prescribe UDAF velocities of
0.2 - 0.45m/s
with increasing flows for higher levels of protection. Air Change Rates should be inversely proportional to ceiling heights! t < 20mins 1:100 (Views expressed do not necessarily reflect those of the IUSS working group) (Deryck Smith Consulting Engineers) DONT REFER TO FILTER EFFICIENCY (%)