Cleanroom & Pharmaceutical HVAC

Air handling for controlled environments, where the design driver is air change rate and pressure cascade rather than cooling load — and the fan has to hold its flow as filters load.

  • 2,496products across this application
  • 777verified manufacturers
  • 6equipment groups

WhatClassified air, not a cooling load

A cleanroom is a space with a controlled airborne particle count, classified under ISO 14644, usually combined with tight temperature and humidity control and a deliberate pressure cascade between adjoining rooms. Air is supplied through terminal HEPA filters and recirculated at a rate set by the classification — which is far higher than any thermal calculation would suggest.

WhoWho buys cleanroom air handling

Pharmaceutical and biotech manufacturers, medical device makers, semiconductor and electronics assembly plants, food and cosmetics producers with hygiene classifications, specialist cleanroom construction companies, and the GMP validation consultants who sign the installation off.

WhereWhere the specification travels

Established pharmaceutical clusters and the newer manufacturing capacity being built in Asia, the Middle East and Eastern Europe. Regulatory requirements are broadly harmonised internationally, so specification travels well between markets — which is unusual in HVACR.

WhenConstruction, expansion and requalification

At facility construction, at expansion into a new product line with a different classification requirement, and at requalification, when a room no longer holds its classification and the air handling has to be upgraded to recover it.

WhyAir change rate drives everything

Cleanroom air handling is dominated by air change rate, not cooling load, and that changes the entire economics. An ISO 7 room needs roughly 30–60 air changes per hour and ISO 5 needs several times that, against perhaps 6–10 in a normal commercial building. Fan energy therefore dominates the operating cost. The consequence most often missed at procurement is that terminal HEPA filters gain resistance steadily as they load, so a fan selected only at clean-filter conditions will lose airflow over the filter's life and the room will drift out of classification long before anyone changes a filter.

HowHolding flow as filters load

Select fans with a flat pressure characteristic and EC or variable-speed drive under closed-loop control, so that flow is held constant as filter resistance rises rather than decaying with it. Design the pressure cascade explicitly, room by room, and make sure the supply and extract equipment can actually maintain those differentials while doors are used. Specify wipe-down surfaces — stainless steel, no exposed insulation, no particle-shedding materials — throughout the air path. And document performance at both clean and dirty filter conditions, because validation will ask for both.

Equipment this application needs

Centrifugal Fans Air handling units Centrifugal Fans293 Plug fans with EC drives, holding constant volume as terminal filters load through their service life. Ventilation Fans Extract & pressure control Ventilation Fans1,640 Room extract that maintains the designed pressure differential between adjacent classifications. Chilling Equipment Temperature & humidity Chilling Equipment88 Close temperature and humidity control, including the reheat capacity that dehumidification requires. Heat Exchangers Energy recovery Heat Exchangers160 Recovering energy from the large exhaust volumes a high air change rate produces, without cross-contamination. Dry Cooler Heat rejection Dry Cooler189 Rejecting process and cooling load, with free cooling available for much of the year. Refrigeration & Heat Exchange Parts Controls & instrumentation Refrigeration & Heat Exchange Parts120 Valves, sensors and controls — all of which have to be documented and calibrated for validation.

What to check before you order

EC Motor 50
Efficient, controllable, and able to hold constant volume under closed-loop control as resistance changes.
Variable Speed 29
The mechanism that keeps airflow constant as HEPA filters load.
Stainless Steel 930
Wipe-down, non-shedding surfaces throughout the air path.
Low Noise 374
Operators work inside these rooms for full shifts at very high air change rates.
Energy Saving 656
30–60 air changes per hour, continuously, makes fan energy the dominant operating cost.

Products for this application

Questions buyers ask

How many air changes per hour does a cleanroom need?
It is set by the classification, not by the thermal load. ISO 8 rooms typically run around 10–25 air changes per hour, ISO 7 around 30–60, and ISO 5 far higher still, often with unidirectional flow over the critical zone. Confirm the figure against the standard and the regulator that applies to your product, then size the air handling to it.
Why must cleanroom fans have variable speed control?
Because terminal HEPA filters gain resistance continuously as they load with particulate. A fixed-speed fan selected at clean-filter conditions delivers progressively less air as that happens, and the room can drift out of its classification well before anyone schedules a filter change. Closed-loop variable speed holds volume constant across the filter's whole service life.
What is a pressure cascade and what does it require from the equipment?
It is a designed sequence of pressure differentials between adjoining rooms — typically 10–15 Pa per step — so that air always flows from cleaner to less clean, never the reverse. It requires supply and extract equipment that can hold those differentials while doors open and close, which in practice means responsive control and fans with enough spare capacity to react rather than fans sized exactly at design flow.

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