Fume Cupboard Fume Scrubber

APMG Plastics’ fume cupboard fume scrubber is the only unit on the market to have been independently tested by MCERTS* accredited personnel.  The fume scrubbing efficiency exceeded 99.8% when tested across a range of contaminant gas concentrations exceeding those encountered in normal fume cupboard operation. Contact us to find out how this rear-mounted fume scrubber provides a reliable and efficient fume scrubbing solution.

The fume scrubber fits neatly behind and beneath the fume cupboard. This allows for greater lab space utilisation along with speedier and easier installation when compared with existing packed bed fume scrubber designs. With removable access panels, this fume scrubber is easily serviced and maintained, keeping downtime to an absolute minimum.

The units are packed bed wet scrubbers utilising both co-current and counter-current gas scrubbing technologies. Co-current: gas and scrubbing liquor flow in same direction. Counter-current: gas and scrubbing liquor flow in opposite directions. The unique design of the APMG Plastics unit ensures that the gas is in intimate contact with the wetted packing media for the maximum amount of time. The depth of the packing is equivalent to 2.5 metres.

Superior efficiency and dependability make this fume cupboard fume scrubber ideal for a wide array of applications including chemical, mineral and metal analysis and inspection. Product reliability is already proven with a number of units currently serving fume cupboards used on a 24 hour cycle with extensive exposure to strong acids.

How this fume cupboard fume scrubber works

The air flow from the fume cupboard (or other source) is split into 2 equal air streams before entering the fume scrubber at the top of the two outer co-current packed sections. The air passes through a Vane-type mist eliminator before entering the random packed bed of 1” Pall rings. The air flow travels downwards through the wetted packing before turning through 180° into the central chamber. Here the divided air streams come together before passing vertically upwards (counter-currently) through the central wetted packed bed. Having passed through this section and the spray distribution above the packing media the processed airstream enters and passes through a vertical droplet separator before exiting the unit through the flanged outlet connection.

The scrubbing liquor is re-circulated around the scrubber via a magnetically driven polypropylene pump and a PVC pipework system. The base of the unit forms a sump for the re-circulation liquor. The liquor within this reservoir is maintained at a constant level by the continuous addition of fresh water from the automatic fill valve and chemicals from the optional pH dosing system. This counteracts the effect of both evaporation and neutralisation. The sump contents must be regularly disposed of in a suitable chemical drainage system or collection tank to control salts build-up and maintain a fresh scrubbing solution.

The fume scrubber unit is constructed from corrosion resistant plastic materials (polypropylene and PVC), ensuring the fume cupboard can remain fully operational within aggressive chemical environments.

Fume cupboard fume scrubber pH control

APMG Plastics fume cupboard fume scrubber can be supplied with a pH level control system. The system monitors the pH level inside the fume scrubber and automatically dispenses liquor as required to maintain the pH level within the unit. The system comprises:

  • Wall mounted solenoid driven pH dosing pump with digital interface, capable of constant or proportional dosing
  • In-line pH probe
  • Chemical suction lance with foot valve, strainer and float switch
  • Chemical injector
  • Interconnecting suction / discharge pipework
Fume cupboards

APMG manufactures a range of commercial fume cupboards fully engineered for smooth airflow and efficient purging of fumes. All our fume cupboards are type-tested to BS EN 14175.


APMG Plastics also designs, manufactures and installs an extensive range of ductwork and vent fittings to complement our range of corrosion resistant Durafan extract fans. All pipework is manufactured to meet HVAC DW/154 Specification for Plastics Ductwork, which is the premier specification for PVC and PP-S ducting.

*MCERTS is the Environment Agency’s Monitoring Certification Scheme. It provides the framework for businesses to meet quality requirements. Compliance with MCERTS gives confidence in the monitoring of emissions to the environment.

Fume cupboard fume scrubber mounted externally

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