Frequently Asked Questions
What does „active storage“ mean and what is the difference between „active storage“ and „passive storage“?
Passive storage means that flammable liquids are stored in tightly sealed containers. No filling or transfer takes place in or at the cabinet and the containers will not be opened for any purpose whatsoever.
Active storage means that flammable liquids are stored in non-stationary containers. At their place of storage, these containers are used as filling or collection containers and may be opened for various purposes.
You will receive more detailed information in our knowledgebase .
Does a safety storage cabinet need to be operated with an industrial exhaust system?
If filling or transfer is carried out at the safety storage cabinet (active storage), the cabinet must not be operated without an industrial exhaust system. If the safety storage cabinet is used for sealed containers (passive storage), operation without an industrial exhaust system is permitted provided the following conditions for the containers to be stored are satisfied:
- The containers stored must be sealed tightly.
- They must be inspected regularly for leaks.
- Opening of the containers must not be possible.
- The containers must not be wet with flammable liquids on the outside.
This must be documented in the explosion protection document, and the ex-zones around the safety storage cabinet that result therefrom must be maintained:
- If a safety storage cabinet does not have industrial ventilation, the interior may pose an explosion hazard and is thus classified as ex-zone 2. The area around the safety storage cabinet is not an ex-zone.
- However, if any of the aforementioned conditions regarding containers is not satisfied, the interior of the safety storage cabinet is classified as ex-zone 1 and the surrounding area to a distance of at least 2.5 m from the cabinet and up to a height of at least 0.5 m above the floor is classified as a potentially explosive area, i.e. ex-zone 2.
- In working areas with industrial ventilation with at least a five-fold air exchange per hour, the potentially explosive area of zone 2 can be reduced to 1 m in front of the safety storage cabinet, 0.5 m on either side of the cabinet and a height of 0.3 m above the floor.
If the safety storage cabinet is used for passive storage, it is therefore advisable to operate it with an industrial exhaust system capable of a least a 10-fold exchange of air per hour. In this case, no ex-zones are assigned to the cabinet.
What rate of air exchange must the safety storage cabinet be operated with?
The rate of air exchange is specified by the operator as part of the risk assessment for the workplace. Generally accepted values can be used as the basis for determining the rate:
For passive storage of flammable liquids, at least a ten-fold air exchange of air per hour is recommended to avoid the formation of an ex-zone. A higher rate of air exchange may be necessary to reduce odours.
For active storage of flammable liquids, the safety storage cabinet must be operated with an air exchange rate of at least 21 m³/h and the ventilation function must be monitored.
Flammable gases should be stored with at least a ten-fold air exchange of air per hour, and toxic gases with at least a 120-fold exchange of air per hour.
Does a safety storage cabinet need to be connected to an earthing system?
Safety storage cabinets without industrial ventilation and safety storage cabinets for active storage must be earthed by equipotential bonding to avoid ignition hazards.
May a fire-resistant safety storage cabinet also be set up outdoors?
A fire-resistant safety storage cabinet, e.g., Type 90 or Type G90, is not suitable for outdoor use. The safety storage cabinet must be operated inside a building, protected from moisture and within a temperature range between -5 °C and 45°C. We offer alternative solutions for storing hazardous substances outside of buildings, such as safety storage containers.
Is it permitted to modify a safety storage cabinet?
DÜPERTHAL safety storage cabinets have been type-tested and certified accordingly. Any modification will result in the loss of their TÜV certificate, and may also impair their function. Please refer to your personal contact person at DÜPERTHAL to discuss your storage situation and find the best possible solution for you.
Is it possible to convert a safety cabinet for storing pressurised gas cylinders into a safety cabinet for storing flammable liquids?
No, because these two cabinet types are built according to different construction requirements and standards. Safety cabinets for storing pressurised gas cylinders are built, tested and certified according to DIN EN 14470-2, and safety storage cabinets for storing flammable liquids are built, tested and certified according to DIN EN 14470-1.
Is it permitted to store different hazardous substances in the safety storage cabinet?
If different hazardous substances are stored together, this may give rise to additional hazards. Therefore, it is only permissible to store hazardous substances together if their joint storage does not increase the respective risks. In general, ignitable liquids must not be stored in safety storage cabinets together with hazardous substances which are capable of causing a fire. Please compare the information in the hazardous substance data sheets with the co-storage charts for the storage categories. This information must be documented in the risk assessment. If necessary, please contact the manufacturer of the hazardous substance.
Is it permitted to store hydrogen and oxygen together in the safety storage cabinet?
Ignitable gases (hydrogen) and oxidising gases (oxygen) may be stored together in safety storage cabinets that conform to DIN EN 14470-2 with certain limitations. Please comply with the guidelines in the safety data sheets issued by the hazardous substance manufacturers and the national regulations.
Does DÜPERTHAL have distributors abroad or can I purchase my safety storage cabinet directly from DÜPERTHAL?
DÜPERTHAL has an extensive network of established distributors all over the world. Simply call us and we will be glad to advise you on the best way to place orders quickly and inexpensively from your country.
What is the standard delivery time of safety storage cabinets?
DÜPERTHAL safety storage cabinets will be produced order-specific. The standard manufacturing time is approx. 4-6 weeks after receiving your written order.
Where do I get a technical data sheet for my safety storage cabinet?
For current cabinet models, you may download the technical data sheet directly from our website. Simply enter the cabinet’s reference number into the search box on our website and select the tab “Data sheet”. You may find the cabinet’s reference number on the label attached to the cabinet door.
Where do I get the certificates relating to my DÜPERTHAL safety storage cabinet?
You will find a copy of all certificates in the operating instructions of your safety storage cabinet. For current cabinet models, you may also download the certificates directly from our website. Simply enter the cabinet’s reference number into the search box on our website and select the tab “Certificates”. You may find the cabinet’s reference number on the label attached to the cabinet door.
I have lost my operating instructions. Who do I have to get in touch with to request new instructions?
I have lost the key to my safety storage cabinet.
Please let us know the key number for the corresponding lock. It is engraved on the locking cylinder, for example. With this key number you can order a replacement key directly from our Service department at +49 6188 9139-157 or firstname.lastname@example.org.
Do safety storage cabinets, laboratory fume hoods, filter units have to be tested/maintained regularly?
According to BetrSichV, TRGS 526, TRGS 510, ArbStättV and the maintenance interval indicated by the manufacturer, all equipment with safety-relevant features have to be checked every year by a technical expert (qualified person) in accordance with TRBS 1203. In order to meet this obligation and to ensure that the safety-relevant features continue to function properly, we recommend that the safety storage cabinets be checked by one of our service technicians once a year.
Please note that in the event of damage or a fire insurers, professional associations and other auditing bodies will immediately require proof of uninterrupted annual maintenance certifications, and that a valid test label must be present.