Exhaust Air and Circulated Air in of harzardous materials storage

For the storage of toxic and and volatile hazardous materials and gases, the legislative bodies sometimes specify an effective (artificial) ventilation, which must be able to handle up to 10 times the volume of air in a room per hour. The relevant text is available in the Workplaces Ordinance, Occupational Safety Ordinance; Hazardous Materials Safety Regulations, Transport Law Reform Act and the Technical Regulations for Hazardous Material. Exceptions are listed in Technical Regulations for Hazardous Material (TRGS) 510, Attachment 3.

PRIORIT provides two ventilation technologies:

  • Circulated air with filter technology
  • Connection to an existing on-site exhaust air system for discharge into the atmosphere

Recirculation technology maintains the flexibility in a room:

  • Permanent monitoring of air and filter
  • On-site filter change
  • Tested and certified system

Exhaust air with on-site installation:

  • affects the basic structure of a building
  • is permanently binding on furnishings selected
  • is expensive to create
  • is expensive due to the loss of energy in the exhaust heat

According to the Technical Guideline for the Handling of Hazardous Materials (TRGS) 510, the legislator permits the operation of safety storage cabinets for the storage of flammable liquids without technical ventilation. However, in such a case the installation location must comply with special requirements with respect to the use of the room as well as Guidelines for Explosion Protection and Prevention.

The establishment of so-called Ex Zones around the cabinet must provide fire protection and explosion prevention as well as health protection for the workers.


  • No costly exhaust air ducts are necessary


  • Permanent establishment of safety zones in and around the cabinet
  • Possible hazard for employees by escaping vapours (explosion hazard)

An effective technical ventilation is required to prevent the escape of flammable liquid vapours in workrooms. When closed, at least a tenfold air exchange per hour must be guaranteed.

The objective of a technical ventilation is:
1) Protection of employees and the environment
2) Preventive measures against the risk of fire and explosion

The type of ventilation depends on structural circumstances
Can an exhaust air duct be installed in the building that leads to the outside?

No – Use of recirculating air technology


    • No expensive structural measures required in the building
    • Flexible and changeable installation of the cabinet
    • Simple and quick installation on the cabinet
    • Use of modern filter technology

Yes – Use of exhaust air technology


    • Easy integration into an existing exhaust air system
    • Simple and quick installation on the cabinet
    • Safe discharge of all vapours
    • No follow-up costs caused by replacement of filters

Recirculated air attachment EBEL:VENT-EN-U

External recirculated air attachment with dust pre filter and activited carbon filter for the extraction of air from the explosive safety zone 2. Includes four LED displays for monitoring the flow rate and filter saturation as well as power cord and power plug.

Optionally available for the following products:

  • Safety cabinets Typ90 and Typ30 PRIOCAB
  • Under-table safety cabinets Typ90 PRIOCAB
  • Fire resistant barrel box PRIOBOX

Extract air attachment EBEL:VENT-EN9-A

External exhaust air unit made of powder-coated sheet steel with two LED indicators for function control for air extraction from Ex protection zone 2. Including air connection adapter for PRIOCAB Type90 cabinet, mains cable and mains plug.

Optionally available for the following products:

  • Safety cabinets Typ90 PRIOCAB
  • Fire resistant barrel box PRIOBOX

Options and accessories

Activated charocal filter and dust pre filter for recirculated air attachment EBEL:VENT-EN-U

Connection adapter with aluminium flexible hose for recirculated air attachment EBEL:VENT-EN-U