The dust filter has no active ingredient and works simply like a sieve, the fineness of which determines the retention capacity. The P3 filter, used mainly in asbestos removal work, retains more than 99% of suspended particles (atmospheric yield) and 100% of non-suspended particles (gravimetric yield). It is also used in addition to pre-filtering in polluted environments requiring the use of activated carbon filters.
P1 or EU5 (according to Eurovent standard)
Filter with Polyester foam preheated to a temperature of 400 ° C for better fiber cohesion. The P1 filter must retain 90% of the so-called gravimetric dusts (or so-called “falling” dust), remaining not suspended in the air.
P3 or H13 (according to EN1822)
Paper fine dust filter filled with fiberglass, the P3 filter must retain 99.995% of the dust from size greater than or equal to 0.3 micron (opacimetric or “flying” dust). It is also called “asbestos filter”.
Active charcoal filters
The porous structure of activated carbon particles, associated with their attraction capacity, allows the capture and retention of harmful substances generated in the atmosphere by chemical and / or organic contamination. Filters are optimized according to the types of contamination to be considered
Type “a” or “ak” or “abek”
A carbon filter is characterized by the type of gas for which it exercises its majority retention; this in connection with a contact time minimum in the media or a speed of passage. The nominal height of a filter Brotec coals is 92mm. It consists of cylindrical particles 3mm diameter obtained by extrusion and retaining the gas considered by adsorption or effect surface film. Brotec filters are made in France and meet the most demanding standards issued by the control and safety bodies (CRAM, CARSAT …)
3 types of filters for charcoal filters
- A For the retention of hydrocarbons (methane, benzene, toluene, etc.) released mainly in depollution work in soils.
- AK For the retention of ammonia present in the treatment of composts.
- ABEK For the retention of ammonia and hydrogen sulphide found mainly in the treatment of sewage sludge.
- HG For the retention of mercury vapors.