Posted by Deutz Lover on February 27, 2020 at 10:06:41 from (66.172.80.74):
In Reply to: Dust mask posted by 37 chief on February 27, 2020 at 09:03:24:
Horrible Freight has several types including Niosh N95.
These filter out 95 percent of particles over 0.3 microns. The coronavirus particle is 0.1 to 0.2 microns so it may filter out some, but not all virus particles. According to recent information the virus is spread mostly by contact. The masks keeps people from touching their mouth and nose. Workers wearing N95 repirators at Wouhan hospital did not get coronavirus. At least ten of the workers at the hospital not wearing repirators came down with coronavirus yet those wearing repirators came into patient contact 7.5 times more often. If this information is correct then masks do help.
A red blood cell is about 3 microns by 7 microns. Most bacteria are over 0.3 microns.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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