single span vegetable greenhouse

single span vegetable greenhouse, plastic film greenhouse,tunnel Greenhouse, plastic greenhouse 1.Greenhouse Framework Hot galvanized steel tube. Diameter 32mm, 1.2mm thickness.We can assure you that our greenhouse structure can be used for at least 10years based on the normal operation. 2.Covering Material of Greenhouse The greenhouse are covered by 150 or 200micron long life film, The film are anti-dripping, includes the high quantity of UV stabilizer,which make the film life 3- 5 years. and all the film are fixed by lock channel and spring lock,Which can guarantee the good air-proof and strong connection of greenhouse 3.Nature Ventilation Side nature ventilation is controlled by film roller or install insect net on the end side for ventilation. 4.Greenhouse Door One set of steel frame door will be equipped at each side of the greenhouse, totally two doors for the greenhouse. The door is very easy to open and close. All doors are covered by the film with good air-proof.