BS EN 1443:2019 Chimneys. General requirements

Thermal resistance
Strength of materials
Construction systems parts
Thermal testing
Grades (quality)
Stability
Marking
Performance
Corrosion resistance
Fire safety
Flues
Chimneys
Classification systems
Temperature
Leak tests
Designations
Service pressure
Fire resistance

Link: BS EN 1443:2019 Chimneys. General requirements
Source: BSI Standards