The 21', 24' and 30' wide RT™ Gutter Connect uses an all rectangular tube frame that offers incredible strength, versatility and labor saving construction. The "RT" Series is an excellent choice if you choose to use natural ventilation. With gutter heights from 8' to 12' you can get the height you need and still save money. All feature an extruded aluminum gutter, double bolt track on each side for easy bow attachment, and poly fasteners extruded inside the gutter eliminating screws and bolts that are usually required to attach lock. Our 30' wide has an arched style roof design that offers an 8' rise from the truss to the peak, our 21' & 24' wide structures incorporate a Quonset roof design, thus providing cooler temperatures from floor to truss. Sidewall heights from 8' to 12' provide more room for tall plants and vegetables.