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12th July 2018, 04:07 PM #16.
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Most filter ratings are a minimum and most are better than their rating. Because fine dust builds up on filters a P2 filter turns into a P3 filter anywhere from a few minutes to a couple of hours depending on what woodworking is being done.
We breathe more bad air though when we walk or drive with so much fumes from vehicles.
If you live alongside a major road on still days there may well be issues. We live about 2km from central Perth, 300 m from one major road and 150 m from a lesser road and I've been running my dust monitors for about a year now and the only time I have ever seen the PM10 (particulate matter <10 microns in ug.m^3) go above "good" is when there have been things like controlled burn offs outside Perth or strong easterlies in summer bring dust in from the agricultural areas. Even today when outer Perth suburbs are registering around 26, my meters are registering 18 which is close to Perth's Annual average (which is similar to all Australian city and major town averages), Highest is Geraldton with 22 and lowest is Gold coast with 13.
I have even taken my dust and gas sensor meters in the car and driven around on major roads with the windows open and as long as there is touch of breeze blowing I rarely see the dust levels rise above average background. Even CO which pours out of car exhausts is only marginally above background.
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12th July 2018 04:07 PM # ADSGoogle Adsense Advertisement
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12th July 2018, 04:17 PM #17Intermediate Member
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- Jan 2018
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- Melbourne
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What I was getting at as long as a respirator is used with a decent filter its what matters.
We have freeways that maze right around many suburbs through the North, East, West and South of the city Melbourne with a radius greater than 30kms.
Sydney would be worse.
Unless your walking around full time with a respirator bad air will be consumed one way or the other. This is part of life.
Taking general care when woodworking is what matters though.
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12th July 2018, 04:45 PM #18Visit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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12th July 2018, 04:48 PM #19
For the purposes of dust (not gases) - when it becomes hard to breath through it (according to 3M). For gases (that they are accredited to keep out) it's when you can start to smell them, or when they are past their use by date. Frankly I think the ubd is a stab in the dark and they are probably deliberately short for butt covering legal purposes. After all - they are carbon filters and I don't really see how that goes "off".
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12th July 2018, 05:01 PM #20.
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- Perth
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On average Melbourne PM10 airborne dust is the same as Sydney, Perth, Canberra, Adelaide and Brisbane all are between (16 and 18 ug/m^3)
Unless your walking around full time with a respirator bad air will be consumed one way or the other. This is part of life.
You will only experience too much dust in air on some days in these cities. More when stuck in traffic on still air days.
It's surprising though how effective even minimal filtration on motor vehicle cabin air intakes make, so unless you sit in traffic with the windows open you are not that badly exposed.
Bear in mind I'm talking about particles, CO, NOx and O3 easily get through cabin air intake filters and will build up around freeways when there is no breeze. it only takes a slight breeze to dilute these and because we don't have 2+ major cities in the same location it rarely builds up to be significant.
Most significant are pollen or desert dust storms that occasionally invade out cities.
Taking general care when woodworking is what matters though.
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19th July 2018, 09:52 AM #21GOLD MEMBER
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24th July 2018, 04:54 PM #22Intermediate Member
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- Jan 2018
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- Melbourne
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4th March 2020, 05:14 AM #23Senior Member
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- Feb 2017
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Rebooting the topic. Time for me to start using a respirator as I have not been using anything which is silly.
What are currently the better options?
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5th March 2020, 07:10 AM #24
2HP dust extractor hooked up to your machinery.
I would love to grow my own food, but I can not find bacon seeds
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6th March 2020, 03:31 PM #25Senior Member
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Not enough room lol.
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11th April 2020, 03:47 PM #26New Members
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- Apr 2020
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- Perth, WA
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Sundstrom SR100 masks are a pretty good option, especially if you're wanting to avoid glasses fogging up. Used them at work for cleaning up rusty welds inside LPG tankers, ends up extremely humid inside the tank. So dusty in there you can barely see your own hands but the mask does the job well and no foggy glasses\face shields either.
Started using it at home after that
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22nd April 2020, 05:33 AM #27GOLD MEMBER
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- Apr 2011
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- McBride BC Canada
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Wipe the inside surface of the mask with an anti-fogging agent. Most sporting goods stores carry sticks of the stuff.
I think it must be no more than a high molecular weight detergent to break water droplet surface tension.
My mother used cheapest baby shampoo for all her back truck windows. 100% effective.
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