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Hoffman main vent stuck closed

I recently replaced my main vents with Hoffman 75's, One main vents quickly(within 2 minutes) and the vent pops shut when the steam reaches. The second main is much slower (10 minutes) and I do not feel any air venting from the main vent. Also it does not pop like the other when the steam reaches it. I think it is stuck in the closed position. It is only a month old, what do I do? The first main is 40 ft long the second is 50 ft both 2.5 inch pipe.


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