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is there a trick to tracing ductwork? some methology other than getting my wife to yell into one end, and me listen at the other? thanks

i have two rooms served by, (i think) the same duct. the returns are sucking air good, but the vents are also sucking in a little air, not as much. all other vents on furnace are blowing hot air ok. the ductwork is not leaking around the blower. i have limited access to the duct, and am...

make sure they are blowing cool air by placing a piece of paper under the vent. sometimes it feels like it's blowing cool air, but it's realling sucking in cool air. hard to tell the difference with your hand.