Intake (fresh air) on a sealed room options

Renfro said:

Burners. They are cleaned regularly and they burn blue flame, proper high altitude versions, I have carbon monoxide detectors.

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Okay. This might be (and might not be) a piece of the puzzle.

The dude who had ethylene poisoning problems had a gas leak that built up partially burned hydrocarbons including ethylene in his grow room. He found the leak, fixed it and the problem went away. I should ask him if he ever vented his room.

When your yields were down during those times you weren't venting, did you notice yellowing leaves or curling leaves, especially new growth?

No problems with the leaves just yields. There are no gas leaks. I am confident of that fact. I did all the plumbing myself and I am a very OCD perfectionist.

plus it will happen in either room that I don't vent. Highly unlikely the same situation is present in both rooms if it's a leak.

If it helps, like I told you on the phone, one room performs better in the winter and the other in the summer. Regardless of if I keep the numbers the same. It's perplexing. The daytime room actually does better in the summer, and thats odd.

Renfro said:

If it helps, like I told you on the phone, one room performs better in the winter and the other in the summer. Regardless of if I keep the numbers the same. It's perplexing. The daytime room actually does better in the summer, and thats odd.

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Yes that is odd...