Dutch Doors? Vents? Fans? Not Sure What To Do!
My husband is in the process of building me a greenhouse. It is 10 x 20, woodframe covered with 6mil poly for now. We kind of jumped into this without doing our research first, and now that I have been reading, I am a little overwhelmed (information overload)! We are in Northwestern Ontario, and I would like to use the greenhouse for veggies (tomatoes, cucumbers etc) and extending the growing season. So, before we get any further on this adventure, I am hoping for some advice...
1. We were going to put in dutch doors at both ends, for cross ventilation during the really hot days, but now I am thinking this is a bad idea as they will let too much heat out?
2. I was thinking of putting one window vent with automatic opener on each side...is this enough?
3. I wasn't going to put a fan in, but after doing some reading I think we might need one, harbor freight has a solar powered fan but I'm thinking it will be too small? we weren't going to wire this baby but I think I can sweet talk my husband into putting power out there if necessary (this project seems to be snowballing!)...what type of fan would be best? When I did the calculation on a greenhouse website it suggested I would need a 20 inch exhaust fan for a rating of 2400 CFM...would this be okay or would I also need a fan to move the air inside the greenhouse?
I hope that's not too many questions! The frame is up, and half the poly is on, so I need to figure this out before we go much further. Thank you!