Silverdale Posted October 14, 2018 Report Share Posted October 14, 2018 I'm looking at the Makita cordless dust extractors and I'm confused by the ratings. In the US the XCV04 & 07 range are listed as OSHA compliant for slica dust which is 99.97% of particulates .3 microns and larger In the UK the DVC861, 863, 864 seem to be the same machine but are only listed as Class L - Removes 99.0% of dust with limit value The UK requires Class M for silica dust which is 99.9% of dust. That seems to be similar to the US OSHA Can anyone explain why the cordless vacs are not Class M? Quote Link to comment Share on other sites More sharing options...
SchenzhenSpecial Posted October 14, 2018 Report Share Posted October 14, 2018 They're not powerful enough. Quote Link to comment Share on other sites More sharing options...
kornomaniac Posted October 15, 2018 Report Share Posted October 15, 2018 Because there is a difference between filtration class and vacuum class. The filters might be good enough to be an ' M class ' filtration ( because they are HEPA filters I believe ) But for a vacuum to be rated as m class u need more then just a good filter. Most important extra is that your vacuum continually checks the flow rate of the air. If it drops under a certain level ( indicating something is clogged up and your vacuum isn't working as it should ) then the vacuum needs to give you a visual or audible alarm. There's a few other little things your vac needs to do/ have to be considered an M class but the reason above is the more important Quote Link to comment Share on other sites More sharing options...
Silverdale Posted October 15, 2018 Author Report Share Posted October 15, 2018 Thanks for the information, I suspected that might the case. So while OSHA has the same filtration it doesn't have the design features or safeguards of Class M. I'll stick with lugging the corded and extension around. My next project is a narrow 4 storey refurb, one room on each floor so I was hoping to simplify the clambering up and down the stairs! I think I'd consider another brand for cordless as the convenience would outweigh the hassle of a different charger. Quote Link to comment Share on other sites More sharing options...
kornomaniac Posted October 15, 2018 Report Share Posted October 15, 2018 There's only 1 cordless m class and that's a hilti that costs... Obnoxiously much Quote Link to comment Share on other sites More sharing options...
Silverdale Posted October 15, 2018 Author Report Share Posted October 15, 2018 Yes, I'd seen the Hilti which is why I got excited seeing the Makita US site extol their capabilities for s dealing with silica, which sounded like M in this country. On a related note, Makita do have some great on-tool dust accessories featured prominently on their US site. I'll have to investigate those too. Has anyone got hands on experience of them? I was thinking of starting with the DX02 for my SDS 243 Quote Link to comment Share on other sites More sharing options...
kornomaniac Posted October 15, 2018 Report Share Posted October 15, 2018 The DX units for the rotary dhr243 works excellent. It's bulky but not heavy. I'd say it captures 90+ procent of dust Quote Link to comment Share on other sites More sharing options...
Silverdale Posted October 16, 2018 Author Report Share Posted October 16, 2018 The biggest issue for me in doing old house refurbs is that the dust spontaneously accumulates as soon as you remove the old carpets and start lifting boards, replacing windows, insulating roof spaces, knocking out plaster for new back boxes, routing new cables and plumbing. It's a constant battle and if you're spending a day doing back boxes it's easy to carry the cordless tools from one box to the next but the vac is a palava that is often ignored - stick on a face mask and live with the dust. So while the Makita cordless isn't Class M, it is more likely to be used.... or maybe I should value my health to be worth more than £1000 for the Hilti. Quote Link to comment Share on other sites More sharing options...
kornomaniac Posted October 16, 2018 Report Share Posted October 16, 2018 Well the Makita is still a HEPA filter. It'll filter just the same dust as the hilti if not more. The Makita just doesn't give you an alarm if the filter for example is clogged up to the point that dust extraction doesn't work anymore and alot more dust will be escaping instead of being sucked up Quote Link to comment Share on other sites More sharing options...
Silverdale Posted October 16, 2018 Author Report Share Posted October 16, 2018 The other feature of Class M vacs is an auto clean filter, and dust bags rather than an open bin. I'm not sure if that is mandatory but it is certainly essential. I'll have to dig into the Makita details later. Quote Link to comment Share on other sites More sharing options...
kornomaniac Posted October 17, 2018 Report Share Posted October 17, 2018 Auto clean filter is not mandatory for an M class. It's a feature many times on thee more expensive m class vacs but it's not mandatory. Dust bags can also be gotten for every vacuum, L or M class Quote Link to comment Share on other sites More sharing options...
Gabriel Posted November 21, 2020 Report Share Posted November 21, 2020 Hi My Makita m class hoover is beeping I have clean the filter very well but still beeping any one have an issue with that Thanks Quote Link to comment Share on other sites More sharing options...
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