Because you really are wasting a lot of energy if you're exhausting air, specifically in just like a cleanse area type lab in which you're bringing in 100% outside air therefore you're having to situation that air. If it is a one particular - depending on the amount of air https://gasrates29742.thezenweb.com/the-smart-trick-of-manage-your-energy-costs-that-no-one-is-discussing-66643656