What is the difference between smoke classes s1, s1a and s1b?
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Answer: There are different smoke classes. Simply put, they are defined as follows: s1: low (little smoke), s2: medium, s3: high (a lot of smoke, no requirements). For smoke class s1, there are 2 additional subclasses that both fall under s1: s1a, and s1b. If you comply with one of these, you also comply with smoke class s1. For smoke class s1, there is no requirement for light transmission of smoke. For subclass s1a has an additional requirement for smoke transmission of more than 80% according to EN61034-2. For subclass s1b has an additional requirement for light transmission of smoke between 60% and 80% according to EN61034-2.
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