Greenhouse sun control / energy curtains can be provided to mitigate solar gain during the summer months and act as energy retention curtains (pulled at night) during the winter months. Bay-to-bay pull systems utilizing peak-flat-peak mounting generally prove to be the best in most greenhouse settings for the roof area. Shaft type, rack and pinion drives utilizing push-pull technology in lieu of cable and drum are recommended for significantly lower maintenance and less structural stress. Cloths can be specified from 30% to 70% shade factor depending on the solar gain reduction desired. WE ALWAYS RECOMMEND FLAME RETARDANT FABRIC BE SPECIFIED FOR ALL GREENHOUSE APPLICATIONS. Full Blackout cloth is also available for photoperiod experimentation, however it must be used in conjunction with blackout curtains for sides and ends. Sun control or blackout curtains on side walls and end walls is accomplished with roll-up systems featuring linear tube motors and desired cloth.