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Results 16 to 23 of 23
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4th May 2009, 12:33 AM #16
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4th May 2009, 02:25 PM #17
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- Feb 2006
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The only "new" H10As I am aware of are the new High Visibility (HV Muffs) which are lime green as compared to black. Are these the ones you are referring to?
The AS/NZS 1270:1999 H10A HV 290 standard rates the H10A HV at 33 db
While ANSI S3.19-1974 H10A HV rates these at 30
If you compare the H10A HV attenuation specs with the specs of the H10A I bought a couple of years back they are identical.
This can be seen in the following graph
The Symbols to compare are the red (H10A) and green (H10A HV). There are no green symbols showing because they are under the red ones ie they are the same
The blue triangles are the H10B ("behind the head") type muffs. They are not quite as good but work better with a face shield than the A's.
Also shown are the Peltor "Bulls Eye". These are marksman muffs and are superior at middle to higher frequencies to the H10A and H10B but not as good at the lower frequencies.
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4th May 2009, 04:04 PM #18
i recently also got a stihl chainsaw and lashed out on the heavy duty 30 db earmuffs. they work a treat, nice and firm on the head and the bunnies polycarbonate wrap around eye protection sit neatly on top of them. quite comfy.
Zed
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4th May 2009, 08:46 PM #19
Sorry, looks like I was conned by marketing ploys that list AS/NZS 1270:1999 H10A HV 290 standard rates and compare them to ANSI S3.19-1974 H10A HV rates to try and sell more
. Maybe I will get some green ones to match my Lucas and make sure I don't get lost in dry jarrah dust to replace my new old black ones
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4th May 2009, 09:06 PM #20
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12th May 2009, 11:10 PM #21
When I was at uni studying for my Design tech teachers degree, I had to do a research assessment of hearing protection, and the highest DB reduction any ear protection can give you was about 36db.
The reason the protection stops at that is because your bones carry the noise and vibration into your ears via the small bones inside your ear connected and surrounding the inner ear.
So wearing ear plugs, and 3 pairs of ear muffs, would still only reduce noise to 36db.
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27th January 2017, 01:28 PM #22
GOLD MEMBER
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- Aug 2016
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- Brisbane
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powered air respirator
I had a chat to an expert that has worked for different safety equipment suppliers for years.
He said the ultimate protection is a powered air respirator combined with ear protection of your choice.
I have never tried one but I'm told they can be lithium battery powered, wrap around your chin for visibility and because they are pressurised they work even while wearing prescription glasses and of course never fog up. Apparently the air flow helps to keep your face 'cool'. I suspect by 'cool' they mean not hot.
There is at least one model that replaces the head protection aspect with a washable fabric cap suitable for woodworkers and others that don't need head protection.
Anyone tried one of these?
Just curious really - because these things are outside my budget range.
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27th January 2017, 04:47 PM #23
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- Join Date
- Feb 2006
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- Perth
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- 1,174
Air powered respirators won't solve the wood dust on skin allergy problem.
This is a much greater risk than cancer from wood dust.
Once you have worked with respirators and then been able to do the exact same work without them you won't ever want to go back.
Good dust extraction is a much better way to go that respirators.
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