This part of EN 13126 specifies requirements and test methods for durability, strength, security and function of rollers for horizontal sliding and hardware for inward or outward sliding folding windows and door height windows in accordance with common application as shown in Figures C.1 to C.7 in informative Annex C. This document is applicable to rollers irrespective of whether they are adjustable or not and irrespective of the method or type of fixing or if they are used independently, or in multiples or combinations. All components of the hardware (e.g. guide tracks, lateral guides, rails, hinges) used while testing the rollers for sliding folding windows and door height windows (window types Q, R and S) are considered to be part of the complete sliding folding hardware set.