This guidance document is intended to provide basic rules, which are generally valid for the mounting & fixing of construction products in the reaction to fire test standards EN 13823, EN ISO 9239-1 and EN ISO 11925-2 which are referred to in the classification standard EN 13501-1. The mounting & fixing rules are intended to ensure that the reaction to fire test results in these tests are representative of the product behaviour in one or more end-use applications when exposed to a fire in the relevant fire scenario. This document contains for each of the test methods the compulsory rules (given in EN 13501-1, EN 13238 and the relevant test standard) and recommendations for groups or (sub)families of products.