Greenhouse Structures, Almería, Andalucía, Spain

In greenhouses, recirculation fans can be used in parallel or series ventilation.
Siting
Siting a greenhouse is huge consideration. In the Northern Hemisphere, the side with the largest surface area should face south. The rule is reversed in the Southern Hemisphere. The greenhouse should get as much unobstructed light as possible. Considerations are given to deciduous trees which will lose their leaves and permit light penetration and also coniferous trees which will generally always block light. The greenhouse site must also be leveled.