This part of EN 13126 gives requirements and test methods for durability, strength, security and function of rollers for horizontal sliding and inward or outward sliding folding windows and balcony doors or patio doors in accordance with common application as shown in annex B, EN 13126-1. This standard is applicable to rollers irrespective of whether they are adjustable or not and of the method or type of fixing or if they are used independently, or in multiples or combinations. NOTE 1 Guide tracks, laterals guides and rails used while testing the rollers for sliding folding windows and balcony or patio doors (window types Q, R and S) are considered part of the complete sliding folding hardware set. NOTE 2 The hinges used while testing the rollers for sliding folding windows and balcony or patio doors (window types Q, R and S) are considered part of the complete sliding folding hardware set. Testing the hinges separately is not required in this case.