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CAPTURE HOOD

capture hood

Capture hoods

Capture hoods, or extraction arms consist of a hood, funnel or other aperture attached to flexible trunking which is either routed to a movable motor / filtration unit or connected to central extraction system.

Capture hoods are designed to take a way fumes, smoke, mists or dusts from the point of production and are commonly used in soldering or welding operations. The contaminated air is exhausted and filtered. The capture hood can also extract hot air generated during work. 

The extraction potential of capture hoods is usually much more limited than fume cupboards and other, larger LEV as they are designed for small scale work and localised generation of contaminants.

Using a capture hood extract system

Before use:

  • Check that the equipment is in a safe condition and the testing regime is current
  • Check that the tubing will not be damaged by products of work processes, e.g. corrosion from fumes
  • Check that all fittings are secure and no holes, misalignments or gaps in the system are present
  • Run the equipment to purge the tubing of any residual contaminates before commencing work
  • Report any faults and do not use if alarms sound or fault indicators show, or there is no suction felt on a gloved hand

In use:

  • Place the capture hood over the work so that contaminated air is removed efficiently (recommended at a distance of no more than 10cm from the contaminant source) - smoke should not waft into your eyes or nose when working!
  • Move the fume extraction around if you change work position

After use:

  • Leave the system running after completion of the work to purge the trunking of any contaminants
  • Clean the work area after use and remember to clean the hood / trunking on a regular basis

Maintenance
Testing and servicing regimes will vary depending on the work being carried out and the airborne contaminants being produced, however filters need changing on a regular basis. There is a statutory requirement that LEV, including capture hoods are tested every 12 months. The test status should be clearly displayed on the equipment.

Further advice
Effective extraction – fume capture is disrupted by drafts or convection processes. If you experience eye, nose, throat irritation or coughing when working, this indicated the extraction is not effective. Stop work and check the positioning of the capture hood.

Movable arms - ensure that any swing arms and other structures cannot work their way loose from the point of fixed attachment and cause injury or damage.         

Damage – as portable devices, capture hoods are more susceptible to damage and require visual checks before and after use as well as a regular maintenance regime. Dedicated storage space can help protect deterioration and damage when not in use.      

 

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