SUNFLEX DOOR RANGES Heavers can deliver the ideal Sunflex Slimline Sliding Patio Doors. Get in touch to discuss your requirements, we can help with any questions you may have. SUNFLEX ALUMINIUM SLIDING SECURITY AS STANDARD All RK doors are fitted with Ultion Locks, no test has beaten an Ultion Lock and has passed all major british standards for security. FIND OUT MORE