Mobile Fume Hoods: Design, Performance & Positioning

Laboratory mobile fume hood

Mobile fume hoods are generally designed as a recirculatory system providing exposure protection from Volatile Organic Substances (VOC’s). Typical applications that a mobile system will be suitable for are: Titration, Karl Fischer analysis, General Solvent Handling, Solvent Disposal etc.

Design Features & Performance Criteria

  • Mobile Fume Hoods should perform to a recognised containment standard. In Europe this would be the BSEN14175 or ‘Safecheck’ Containment test and in the USA the ASHRAE 110-1995 test protocol would be the recognised test standard.
  • The Filter efficiency must be tested in accordance with BSEN7989 in order to determine its efficiency for the application required.
  • An airflow alarm (Audible and Visual) must be installed to monitor airflow performance.

Positioning of Mobile Fume Hoods

The same criteria apply for a mobile system as for a fixed system. Incorrect positioning will affect the containment performance of any safety cabinet.

Laboratory hoods should not be located:

  • Near doorways as movement in and out of the area can affect performance.
  • High traffic areas where personnel will be frequently passing the fume hood openings.
  • At right angles to each other, as airflow will be affected causing ‘dead spots’ across the face of the hood.
  • In remote corners of the laboratory as air turbulence may be a problem.
  • Close to or directly under supply air vents unless supply air is dispersed effectively minimizing turbulence.
  • Fume hoods should not face each other directly unless separated by a distance of at least 3 meters (10 Feet). Fume hoods positioned closer than this may end up fighting for air and so affect containment performance.

CTS offer a wide range of ductless mobile cupboards and also manufacture bespoke safety systems, please get in touch to discuss your requirements.

Lab-Bubble™, as shown on the feature picture, is a bench mounted portable fume hood manufactured by CTS Europe, for more information, please visit