Classification on H Class and Hepa Class Vacuum systems for Concrete Silica Dust
Dust extractors are used to improve the working environment, and to reduce levels of hazardous dust in the air to a minimum. This places great demands on the ability of the dust extractor to separate fine dust. We use a fine filter in our mobile dust extractors, which separates most of the dust. But in order to capture close to 100% of the finest and most dangerous particles, we always complete the design with a HEPA H13 filter.
Here at Dustcontrol, we use conical pleated filters in all of our dust extraction units. A pleated filter has a very large area in relation to its physical size. The dust extractors can therefore be compact in relation to the large filter area they contain.
Only original Dustcontrol filters are tested and approved for use in our machines. The use of other types of filters could lead to the leaking of hazardous dust and/or machine breakdown. Dust-
control’s warranty only applies to machines equipped with original Dustcontrol spare parts. The filters are certified in accordance with current European requirements for dust extraction. This ensures that, with correct handling, optimum filtration will be achieved. Follow the instructions when handling filters, so that they can be replaced without exposure to hazardous dust.
To ensure that the filters comply with the requirements of relevant regulations for health and safety at work, a number of different testing standards are used. These are described below:
The test methods used in current standards for dust extractors and filters are always based on particle counting. By injecting particles before the filter and by using a particle counter to determine the concentration before and after the filter, the penetration can be calculated (a penetration of 0.1% is equal to a degree of separation of 99.9%). The test is carried out in several stages by individually examining the filter media, the complete filter cartridge and, in some cases, also the complete unit.
HEPA filters — High Efficiency Particulate Air Filters
When classifying HEPA filters, Dustcontrol uses the strict HEPA standard (EN 1822-1). It is divided into different levels (E10 to H14) depending on filtration efficiency. Dustcontrol applies level H13, which can separate up to 99.95% of the particles between 0.15 and 0.30 µm in size. This particle size is used because it is the hardest to separate – both larger and smaller particles are easier to capture in a filter.
In IEC-60335-2-69 (EN-60335-2-69), the standard for testing wet and dry extractors, dust extractors are classified into three categories –– where the H category is the most stringent. (Please note: do not con- fuse this “H” with that in HEPA H13). The category required for a specific application is decided on the basis of the permitted maximum concentration for that type of dust (MAK) in the working environment or by local regulations.
The test according to EN-60335-2-69 comprises two parts:
- A test of the filter system – in our case, a fine filter and a HEPA H13 To achieve category H, a degree of separation of 99.995% is required, where 90% of the test particles must be smaller than 1.0 µm. Our fine filters comply with cate- gory M, and our HEPA H13 filters with category H.
- A test of the “assembled unit” – in our case, a complete dust extractor. Here, 99.995% efficiency is also required, however 10% of the particles must be smaller than 0 µm, 22% smaller than 2.0 µm, and 75% smaller than 5.0 µm.
The filter systems in all Dustcontrol dust extractors are built to comply with the stringent IEC machine classification H.
Concrete dust affects every construction and job site. Be it grinding concrete floors, grinding concrete high spots, grinding off glues, adhesives, coatings or epoxies, grinding waterproofing membranes or blackjack removal, dust is a bane – everywhere.
Dustcontrol Vacuums range from a small compact DC2900L Single phase Vacuum designed to be used alongside Handheld Angle Grinders and smaller 250mm Stand behind Concrete Floor Grinders through to Separator units DC3900L, DC3900L Vacuum and Separator system, through to a Three phase DC5900L 4kW and 11kW Vacuum system and DC400, 15amp Tromb Vacuum setup. Each vacuum ranges in capacity, suction and power through to a Longopac drop-down Vacuum system.
See the range instore today,
or Check it out online, http://www.allprep.com.au/product-category/dust-control/vacuums/
Workplace Health and Safety has a lot of information further on Concrete dust and respirable crystalline silica online. The below link has valuable information related to concrete floor grinding and concrete silica dust.
Dustcontrol Concrete Vacuum systems allow you to ,
- Help to stop and reduce the dust
- Help to control the dust, both airborne and surface dusting from concrete floor grinding, scarifying, scabbling, concrete floor sawing, concrete cutting, concrete core drilling and other related activities
- Maintaining and reviwing the controls