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Pharmaceutical Manufacturing Handbook: Production and

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222 CLEAN-FACILITY DESIGN, CONSTRUCTION, AND MAINTENANCE ISSUES<br />

Outside<br />

air<br />

FIGURE 17<br />

Outside<br />

air<br />

FIGURE 18<br />

plenum.<br />

95% Prefilter<br />

30% Prefilter<br />

Preheat coil<br />

Reheat coil<br />

Cooling coil<br />

Fan<br />

Make-up air unit<br />

Humidifier<br />

Prefilter<br />

Cooling coil<br />

Fan<br />

Air h<strong>and</strong>ler<br />

HEPA filter<br />

Clean room<br />

HEPA filter<br />

Ceiling diffuser<br />

Prefilter<br />

Cooling coil<br />

Air h<strong>and</strong>ler<br />

Non - unidirectional clean - room with air h<strong>and</strong>ler mounted HEPA fi lters.<br />

95% prefilter<br />

30% Prefilter<br />

Preheat coil<br />

Reheat coil<br />

Cooling coil<br />

Make-up air unit<br />

St<strong>and</strong>ard velocity<br />

HEPA filters<br />

Fan<br />

Humidifier<br />

Prefilter<br />

Cooling coil<br />

Air h<strong>and</strong>ler<br />

Fan<br />

Clean room<br />

Non - unidirectional clean - room with critical area unidirectional fl ow<br />

duct distribution network consisting of rectangular or round trunk ducts <strong>and</strong> fl exible<br />

or rigid round branch ducts. Full coverage, typical for ISO 5 (Class 100) clean rooms,<br />

or partial coverage, for higher class (less stringent) clean rooms, can be accomplished<br />

using 2 × 4 - ft lay - in HEPA fi lter modules installed in the ceiling.<br />

3.3.3.6 Clean - Room Testing<br />

ISO 14644 describes methodology <strong>and</strong> instrumentation for particle counting in the<br />

clean room. The tests described there are the basis for assigning a cleanliness rating<br />

Fan<br />

Cooling coil<br />

Fan<br />

Prefilter<br />

Air h<strong>and</strong>ler<br />

Unidirectional airflow over<br />

critical process machine/surface<br />

High-velocity HEPA filters<br />

Pressure plenum<br />

Air distributor

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