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Old 04-22-2010, 05:53 AM
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Dave Dave is offline
Join Date: Dec 2005
Location: Alabama
Posts: 18,001
When I train workers to use respirators one of the steps involves them doing a negative pressure test for 10 seconds to see if they have a seal. So I tell them to do it and they never get close to 10 seconds before they stop. Then I have them do it and I time them. Many are surprised at how long 10 seconds can be when in an unfamiliar environment.