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I am a new owner of a Rion 8 x 8. I have been learning a lot from all your posts. Greenhouse is heating up to 88 here in zone 7. Am thinking about purchasing an exhaust fan. Any advice where I can get one that you are happy with. I have one automatic roof vent and one automatic window. I have seedlings started and am running a fan 24/7. I am adding a misting system shortly and will add shades this summer if necessary. Should I put the exhaust vent on the north or south side? If you insulate the north wall do you leave it up all summer? Do you think I have enough ventilation. Any advice for this new greenhouse owner would be appreciated. I realize it is difficult to regulate the temperature in a small greenhouse and am already wishing I had gone bigger. I have a small heater that seems to be keeping the greenhouse warm at night, but want to add a thermostat to it.
I would suggest installing the exhaust fan on the lee side of the prevailing wind it will have less work load, and last longer. You need approx. a 12-14" fan with twice the vent as fan. Your vent and window would be adequate I'd imagine. As to a source check online: Greenhouse Supply, Charley's Greenhouse, etc. Prices will vary a lot as to what you want or need. Some are available prewired with a thermostat and multispeed. Hope this helps a bit. Holly"s Ric
I bought a household gable fan with louvers with a thermostat from Amazon.com. It isn't specifically for greenhouses, but has a good area and air-flow for a much better price than a "greenhouse" specific fan. It is working nicely for me.