Exhaust fan and cold air vents are finally installed. I didn't want to fork out extra money for louvered air registers ($30 compared to the $8 I paid for these return registers), and now I regret it. I might create a sliding shutter on the inside of the cold air vents so I can close them when needed - but then I'm thinking they should actually be open always to allow some air circulation so I might leave as is. I also don't love that wind easily blows the exhaust fan louvers open. Not sure there's a fix for that though - maybe an extended box around the outside to keep the wind from blowing across the louver doors, but that would get in my way when walking behind the greenhouse though which is the most direct route to the compost piles.
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