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Question:

According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ______ during a standing vacuum test, the system should be checked for leaks.

A 2.5 mm Hg
Explaination

According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above 2.5 mm Hg during a standing vacuum test, the system should be checked for leaks.