Butterfly Roof Opening Greenhouse 

1. Structure: All Hot-dip galvanized 275g; Butterfly type with movable roof vent; Good for natural ventilation and heat insulation.Suitable for place hot in summer and cold in winter; like Kazakhstan, Uzbekistan,etc
2. Covering material: PEP Film or Ginegar Film.
3. Ventilation: Side manual or electric while roof driven by pinion&rack. 

A-Double layer heat keeping system
B- Four sides heat insulation system
Span Width:7.0m/8.0m/9.6m;    
Gutter Height: 3.0m/3.5m/4.0m/4.5m/5.0m;
Section Size:4.0m/5.0m