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So pulling out of a return is okay? Will a furnace use the return when the AC is running?

Thanks for all your replies! I two 6 inch max fans, trying to cool 2 lights. I want to run a sealed room. However, my options are as follows. I have a old ass heat unit in my crawlspace. I could pull directly from the cold air return in the laundry room and through the laundry room down into the...

Anyone else have any ideas?

Thanks for you quick reply. I think if i pull air from another room and through sealed hoods and into the return it should be okay. With not much air getting out the the sealed room and a carbon filter on all the time.

Is it safe/smart to vent hot air into an air return for a furnace/ac? (or pull air from a return?) What one would be better? Thanks.