UNE-EN 16475-3:2016+A1:2021 Chimneys - Accessories - Part 3: Draught regulators, standstill opening devices and combined secondary air devices - Requirements and test methods
2021UNE-EN 16475-3:2016+A1:2021 Chimneys - Accessories - Part 3: Draught regulators, standstill opening devices and combined secondary air devices - Requirements and test methods