Clean zones

A clean zone is a local spatial structure which is constructed and used to minimize entry, generation and retention of particles within that zone.The clean zone is constructed as an independent object based on a “room in the room” structure.

Main purpose of the clean zones

Maintenance of the air environment’s indicated parameters in a local work area;
Product protection from the outward influences.
Parameters of the air environment maintained in the working area depend on the technological process performed in the clean zone; however, as a rule there is one parameter – air cleanliness (both microbiological and from mechanical particles).

Application area

Clean zones are used in all manufacturing areas with high requirements to the air cleanliness, for example in pharmaceutics, perfume and cosmetics production, food production, etc.

TYPES OF CLEAN ZONES

Configurations

A TRANSPORTABLE CLEAN ZONE

with a mandatory verification of filters being hermetically sealed after moving.

A STATIONARY CLEAN ZONE

Clean zones can be produced stationary when their structures are fixed rigidly on the floor, walls, ceiling and other load-bearing structures of the room.

Benefits of the clean zones

A clean zone may be used inside a clean room as well as in a regular room.
Small size of the zones allows locating them in any type of a room.
Regarding the air cleanliness level, the clean zones match with the clean rooms; however the zones are more cost-effective solution.
Clean zones are mobile – they can be used where needed at the moment (modular demountable construction).

Design as per ISO 1444-1

Features

The ceiling is completely made of filter fan units.

The cleanliness of the work area is ensured by forcing contamination away with unidirectional clean airflow referred to as “air piston effect”.

Along the periphery of the ceiling, there is an enclosing structure elevated above the level of floor.

All the joints of the clean zone are sealed with chemically resistant rubber or a polyurethane sealant for clean rooms.

A clean zone can be equipped with required number of doors for personnel passing and product transferring in case the enclosure is made of rigid materials.

Examples

Features

The ceiling consists of a few filter fan units. Their number is determined based on the required number of air changes inside the clean zone taking into account its configuration and dimensions.

A low turbulent airflow is supplied into the clean zone ensuring air cleanliness by diluting, reducing the concentration and removing the aerosol particles.

The configuration of the ceiling in this case is based on raster principle; its meshes are equipped with filter fan units and lights. The rest or the area is closed with top panels.

The work area is defined with enclosures fixed along the periphery of the clean zone and extended down to the floor level.

To ensure positive pressure inside the clean zone, its enclosure is equipped with transfer grids or anemostats.

Examples

Components of a Clean Zone

A clean zone can be additionally equipped with air cleanliness monitoring system equivalent to the one described in Clean Rooms section