open roof greenhouse, open roof, open air FEATURESThe use of growth regulators is decreased as the design of the Open Air allows the environment to harden and condition your crop, resulting in less damage when shipped, improved longevity on the garden center bench, and increased performance in the garden. Multiple glazing systems are available: glass, double poly, 8mm twinwall or 16mm twinwall. Venlo style peak offers easy reglazing when glazed with double polyethylene. The rack and pinion drive system minimizes maintenance. Standard and custom widths are available; standard widths are 24'(7315.2mm) and 36'(10972.8mm), and the Open Air is available in various heights to accommodate your needs. Complete design specifications and structural details are available SPECIFICATIONS Available Widths The standard widths of the Open Air structures are 24'-0"(7315.2mm), 36'-0"(10972.8mm) and 42'-0"(12801.6mm) wide. Custom widths are always available. The structural details below are based on a 24'-0"(7315.2mm) width.