Glossary - V

variable geometry friction stay hinge (np)
variable geometry stay hinge where freedom of movement is controlled by friction

variable geometry hinge (np)
casement hinge with pivot carried on sliding or rotating component that moves during opening

variable geometry stay hinge (np)
casement hinge with multiple links between window and frame to produce a specialised pattern of movement (see also CEN/TS 13126)

vertical rod (np)
(Product specific term - see EN 179 & EN 1125)

viewing angle (of door viewer) (np)
included angle of cone of vision defining the limit at which objects can be seen