It would be ideal to have air circulating, but if they are covered up for a couple of hours they should be okay. Just remember to "burp" the containers and blow a breath or two of fresh air in if they are going to be locked down for an extended period.
MVP Reviewed by MVP on . Just can't figure this out I have searched and searched but can't seem to find someone with the same conditions and problems, i will list off my whole story. - Bag seed(same bag) / germinated very well - they were started in small pots in miracle grow potting soil - Under 6 4ft. fluoroscents/ 4 cool white,2 full spectrum sunshine bulbs, sunshine bulbs are 5000k,2250 lumens - lighting is 24/7 - In closet 3 ft. wide,9-10ft. tall, 8 ft. long (approximate) - ventilation out but not in/ door opened few times a day Rating: 5