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from www.indiamart.com
The word 'ventilation' comes from the latin ventilatio, in turn from ventus meaning wind, which was described in 1660 as. cfm of outdoor air per person was written into massachusetts law in the 1880s. modern mechanical ventilators—whose short supply is now at the center of a national debate about the nation’s preparedness. a breakthrough arose in the 1770s, when the chemists wilhelm scheele, joseph priestley and antoine lavoisier independently discovered. the origins of modern mechanical ventilation can be traced back about five centuries to the seminal work. origin of the word ventilation. Ashve adopted a minimum ventilation rate of 30. when fire appeared in egyptian kitchens, there came a need for vents to remove smoke and supply fresh air.
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From www.azdiyguy.com
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From reckolkata.com
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