Greenhouse: ventilation and shading
Solar Fans for Greenhouses Ventilation Requirements & Exhaust Snap Fans
Greenhouse Fan & Shutter
Greenhouse Ventilation Info – Controlling Greenhouse Temps
The Pros & Cons of Different DIY Greenhouse Types: http://homeandgardenamerica.com/greenhouse-types-pros-and-cons
In the summer, and even in other months in warmer climates, keeping the air inside a greenhouse cool is the main goal. Read this article to find out more about ventilating your greenhouse.
plastic greenhouse ventilation equipment $10~$200
Found it at Wayfair - Outsunny 7' W x 15' D Greenhouse