Muiti Span Tunnel PC Sheet Greenhouse for Vegetable and Fruit

Greenhouse frame
The greenhouse frame is made by the materials of galvanized steel, connected by screws, bolts or suitable connecters. Door, gutters, etc. can be equipped and the roof can be pitched roof (supported by rectangular tubes) or arched roof (supported by circular tubes). The uprights of greenhouse is made by the rectangular tubes.
Covering material
1. Glass is available on the roof or the side of the greenhouse, thickness of which can be 4mm or 5mm.
2. PC(Poly-carbonate) sheet, hard and durable, anti-ultraviolet, can be available on the roof and the side of greenhouse, thickness of which are, for example, 8mm or 10mm.
3. Film, heat-preserving and durable, can be available on the roof and side of the greenhouse, thickness of which can be 8mm, 10mm, 12mm, 15mm, 20mm, etc. And more layers of the film can be used on the greenhouse.
Optional system
Cooling system (cooling pad and fan)
Heating system (water, oil, coal heating)
Supplementary Lighting system (Philips sodium lamp)
Shading system (inside and outside shading)
Irrigation system (drip irrigation, mist system etc)
Seedbed ( movable, fixed )
Ventilation system ( roof and side windows)
Circulation System
Control system ( control all system running situation)