ISO 11925-3:1997 Reaction to fire tests -- Ignitability of building products subjected to direct impingement of flame -- Part 3: Multi-source test https://www.iso.org/standard/21805.html Introduce other types of flames. Simulate fire sources in all types of life; two types of fire sources, diffused (more natural) and premixed fires Gas source, propane, Note: The flow meter should be calibrated, soap bubble method. 9.3 Type of fire source with ISO 11925-2: but with propane flow requirements, reference, 25 degrees, 25 ml/min Other types of fire sources, various types of fire sources