This retractable-roof greenhouse allows crops to benefit from the natural outdoor environment, when suitable, yet protects crops from adverse conditions when necessary. It is available with either an A-Frame or Flat-Roof profile. The design allows the roof to open and close during winds up to 50 mph and supports wind loads up to 120 mph and snow loads up to 70 lbs. per sq.ft. Both designs withstood direct hits from the Florida hurricanes without damage to the roof covering or structure. The range of environmental controls expands with the use of optional interior curtains and sidewall systems: clear woven poly, white woven poly, blackout heat retention and insect net. Cravo Equipment. (888) 738-7228.