Engine : Expired / General Subjects - 963/881
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| What pressure drop across an air-conditioning filter is indicative of a need to replace or clean the filter as appropriate? |
| A) 0.1 inches of water column |
| B) 0.5 inches of water column |
| C) 1.0 inches of water column |
| D) 5.0 inches of water column |
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