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Re: how does air get into system besides improper handling?
Posted to HVAC Forum on 9/18/2001 4 Replies

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Hi Mani,

I mentioned in my response to you, "PSIG." PSIG is gauge readings calibrated to 0 at atmospheric pressure. Anything below 0 PSIG is considered a vacuum. PSIA is atmospheric pressure reading... Login to read more.

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