DIY Exhaust Shutter
I decided that the exhaust fan and shutters were too expensive for my greenhouse. Actually I have overdone my budget of spending on my house and dont have the funds to get or spend 300 bucks on a fan and automatic intake shutters. I decide to use a 3 speed fan for my exhaust. I needed to protect it from the elements though. I built a 10x13 wood framed shutter box out of the cedar siding that I used on my build. It works well. They are basically two flaps. They open on out pressure and then drop down when the fan kicks off. I doubt that they will seal up as well as the expensive shutters but here in zone 6 I should be ok. Im learning its much more important to cool during these bright days. I had a day a few weeks ago where temps got to 100 degrees in there.