Grower Select® Spring Lock Roll-Up Shaft 12ft Aluminum spring lock roll up shaft used for sidewall ventilation. Wires and couplers sold separately. Grower Select® Roll-up Sidewall System has been designed as a low-cost ventilation system with no additional electrical requirements or costs to operate. The customized aluminum roll-up shaft comes in 12ft lengths and has been designed to accept our standard Grower Select® Spring Lock Spring for easy attachment of the poly to the shaft. We offer two different gear boxes; one for houses under 100ft and the other for houses over 100ft but less than 240ft.
