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Re: 55 years ago I was given this USAF 54 3100
Was curious as mine started running rough at idle so i dried out the bad filter put some tubing on and just blew through it. I could feel resistance that changed when i shook it at same time. Took last unused one and compared. Big difference. The bad one was blocking at least 15-25% of air flow. All are going in the trash.
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