Passive: (Charcoal Canisters, Electrets, etc) Take an initial short-term test for at least 48 hours. After the first test has been completed, take a follow-up short-term test for at least 48 hours. or Take two short-term tests at the same time in the same location for at least 48 hours. |
Fix the home if the average of the two tests is 4 pCI/L or more. |