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Jan 9 '14 at 14:45 comment added tmcallaghan Thanks. I've blocked them all with home made covers that I secured with zip-ties.
Jan 8 '14 at 21:00 comment added BD72 With out knowing your specific duct design it would be hard to know why some do and some do not. Blocking the returns that are moving cold air should do the job.
Jan 3 '14 at 20:06 comment added tmcallaghan What I find confusing is that there seems to be a random set of drops/returns that have a lot of cold air coming out of them and the rest have none (as verified by my laser temp reader). All the drops have slats that I can shift to close most of the air passage. Should blocking all the returns (that don't have movable slats) be enough?
Jan 3 '14 at 19:10 history answered BD72 CC BY-SA 3.0