The Telstar downflow booth provides the highest levels of operator protection from potentially harmful airborne contaminants generated during manual powder handling operations such as sampling, charging and dispensing. Achieving Operator Exposure Levels (OEL) typically between 50 and 100µg/m3 TWA the booth also provides product protection (Class ISO 5) from surrounding area contamination by creating a clean processing zone minimizing cross contamination risk from other products/processes. Lower levels of containment (10µg/m3) can be achieved by utilizing purpose designed workstations and containment screens. The downflow booth operates on a recirculatory push-pull airflow principle providing containment by air movement. A clean, constant, turbulence free, unidirectional downflow of air is supplied from the ceiling, suppressing any dust clouds generated during open powder processing, removing and capturing airborne particles from the operator’s breathing zone. Downflow Booths Standard Series Modular and compact design

Operating conditions

• Laminar flow velocity: 0,45 m/s (+/-20 %)

• Bleed air: around al 10% - 15%

• LED Light intensity: > 600 lux

• Voltages:

• 230 V II + T 50/60 Hz

• 380 V III + N + T 50/60 Hz

• 230 V III + N + T 50/60 Hz

Highest operator protection

Exhaust air grilles at the base of the rear wall capture the generated airborne contaminants. The exhaust airflow then passes through a series of filtration stages before returning through the booth ceiling plenum. A small percentage of air is discharged from the booth through the bleed exhaust port to maintain the working space under negative pressure, minimizing airborne contamination breakout.

The common advantages of containment by airflow systems are:

• Unrestricted operator access to the target operation (i.e. no physical impediment offered by the containment equipment).

• Flexibility to handle a large range of container types (i.e. fibre kegs, bags, IBC’s, etc.).

• Capability to integrate additional process equipment.