The 12” Slimline letterplates have a robust ABS moulded frame set with internal and external sprung flaps.
The external flap has been designed to be opened to approximately 132 degrees, giving generous access to the sleeve aperture.
Torsion bars are used to spring load the flaps, this solution has successfully achieved a 40,000 cycle endurance test. This would equate to use four times a day over a period of 27 years.
The standard ABS sleeve set is 40-40 and is suitable for door thicknesses 40 to 76mm.
Aperture Size 258mm x 30mm Nominal.