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While the use of tobacco products was growing in popularity, the American Civil War afforded the fledgling company an opportunity that brought enormous financial success, leading to Macdonald Tobacco emerging as the preeminent tobacco company in Canada

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Each filter is precision-engineered for easy rolling and secure attachment.

13,17 Some authors simply estimated the CADR by measuring the units airflow (with an anemometer or other method) and then multiplying this value by the filters removal efficiency, based on the manufacturers claims