Our filter systems are specialised in filtering dusts, gases and aerosols from the air and meet high requirements for tightness in their processes. They are used in nuclear power plants, high-security laboratories, hospitals, isolation wards and industrial settings, manufactured from stainless steel grades 1.4301, 1.4404, 1.4541 and 1.4571 and custom-designed. Our systems fulfil DIN 25496, ISO 3834-2, KTA 1401, ASME AG-1 and ISO 19443, with protective bag replacement methods, seal seat testing devices, optional disinfection and measurement sockets and volumetric flow rates up to 48,000 m³/h per housing. Our components are built for ventilation and air-conditioning systems in areas with the highest tightness requirements: the nuclear industry, biological high-security laboratories and isolation wards, the pharmaceutical and chemical industries, hospitals, the food industry and chemical weapons dismantling processes.

Safe-change HEPA filter systems SCFhightec and SCFclassic

Especially designed for the ventilation of sensitive areas such as laboratories, chemical, pharmaceutical or nuclear technology, where radioactive, toxic or pathogenic substances must be filtered from the air to protect the environment, production or health. This compact filter housing can be adapted to almost any demanding filter task and can be configured in a variety of ways.

• SCFhightec: nominal volume flow up to 48,000 m³/h; up to 16 filter elements per filter stage in one housing; SCFclassic: up to 24,000 m³/h
• Admissible differential pressure ± 6,000 Pa; design temperature 90 °C; radiation resistance ≤ 10⁵ Gy
• External tightness (housing) and internal tightness (filter seat) to DIN 25496: leakage < 3·10⁻⁵ of nominal flow at Δp = 2,000 Pa
• Sturdy stainless-steel housing, e.g. 1.4541, gas-tight to DIN 25496 for fine dust and HEPA elements; leak test of HEPA elements; contamination-free exchange via bag-in/bag-out; only one operator side
• Optional scanning system (manual or fully automated) for in-situ efficiency measurement per EN ISO 29463-4; fumigation sockets for formalin or hydrogen peroxide; integrated gas-tight shut-off dampers; pre-filter, HEPA and activated carbon replacement element stages
• HEPA filter housing type GS: a less expensive alternative for series installation in circular ducts, DN 300, same DIN 25496 tightness

Re-cleanable HEPA filter systems RHFhightec and M-RHFhightec

Re-cleanable HEPA filter systems are for demanding requirements on the filtration efficiency (HEPA), for high particle concentrations and abrasive dusts. Volume flow 350 to 6,000 m³/h (mobile); ± 6,000 Pa; 90 °C. Patented reinforced RHF elements in standard size; very high cleaning pressure; contamination-free dust discharge into maintenance bag via hopper; HEPA safety secondary stage. Suitable for concrete dust, concrete pieces, plasma dust, laser dust, graphite dust, asbestos and welding fumes. Advantages: low disposal costs, less frequent element replacement, optional reuse of cleaned dusts. Applications: dismantling of nuclear plants, pharmaceutical production, battery manufacturing.

Mobile HEPA filter systems MFUclassic and MFUhightec

Mobile HEPA filter systems combine pre-filter and HEPA filter stages with a fan as well as the necessary control. They are supplied ready to plug in and are used for temporary applications, e.g. during the maintenance phase of HVAC systems or non-dusty work. Nominal volume flow 3,000 m³/h; F6 pre-filter to EN 779 and H13 HEPA to EN 1822; tightness to DIN 25496. Applications: nuclear technology, nuclear decommissioning, industrial.

Remote-controlled and in-cell filter systems

Krantz filter systems can also be used for hot areas. For this purpose, filters can be changed using manipulators. Leak tests for the filter seat and damper seat as well as the actuation of shut-off dampers are conducted via gas-tight wall penetrations. Monitoring and testing therefore takes place in non-hot areas. Our re-cleanable filter systems can also be equipped in such a manner that they can be operated remotely and that no operating personnel need to be on site to change the filter or remove dust. We can also supply gas-tight wall penetrations for all measuring, control and regulation lines, customised to the respective on-site conditions.

Sorption and adsorption filter systems EWS, MWS and WFZ

Krantz adsorption filter systems of the type EWS are used for the adsorption of high-risk gaseous pollutants (e.g. radioactive iodine, chemical warfare agents) that require a long dwell time. Nominal volume flow up to 30,000 m³/h per system; admissible differential pressure 10,000 Pa; dwell time 0.25 to 2.50 s; flow velocity < 0.5 m/s. Stainless steel housing gas-tight to DIN 25496 to accommodate activated carbon; sampling system for carbon loading; contamination-free carbon discharge into maintenance bag (safe change); pneumatic injector filling. Applications: nuclear technology, decommissioning of chemical weapons, industry. Sorption change filter cells type WFZ and adsorption filters type MWS complete the range, designed to remove gaseous contaminants such as organic and elemental iodine compounds.

Incident filter systems DFM Iodine and DFM Aerosol

Failure of the reactor containment vessel of a pressurised water reactor as a result of a severe core meltdown accident can be prevented by a controlled safety damper that blows off into the flue via an accident filter system. The filter concept consists of a filter housing with an inserted molecular sieve for the retention of elemental iodine and methyl iodide. Nominal volume flow 28,000 m³/h; filtration efficiency for elemental iodine and methyl iodide minimum 90.00 %; eight parallel bulk beds; stainless steel only; catalyser poison added against hydrogen-induced catalytic reactions. Optionally combined with DFM Aerosol.

Filter elements, test devices and accessories

HEPA filter elements H13 and H14; fibre filters type F and type G; leak testing device LTD and LTD-S; oil thread testing device OEFT-3; film sealing device HSD; mobile measuring trolley; precoat material for re-cleanable elements; pressure equalisation filters; hollow cord rings, maintenance bags and scissor lift table for contamination-free filter changes; pneumatic filling device for adsorption filter systems; distribution systems for disinfecting filter housings type Oktopus; trace heating for filter systems against condensation.