The CGI Estate Collection horizontal rolling window is available in very large sizes up to 111″ x 76″ (58.5 SQF) in two and three panel configurations and with very high design pressures as high as +120 /-150 PSF.   Each operating sash is manufactured with a pair of patented stainless steel ball bearing supported quad rollers that ride on a nylon track providing a consistent and durable window operation.