I'm not understanding the feeling that it is dangerous to block a vent to force more air through the other one. As Skip says, some vents come with adjustable louvers just for that purpose. Crimped ducting as some have suggested as a source of the no heat condition would do a lot more to knock the furnace out of kilter than would a closed vent. If the practice is dangerous I have been living on the edge of disaster for many years.
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