In fire protection documentation, a specific make is specified that meets the technical requirements placed on the product. But in order not to favor a particular supplier, "or equivalent" is stated in procurement and the fire protection documentation. In the case of procurement that deviates from the original regulations, it is the responsibility of the building trade to prove that the properties are equivalent, just as it is the responsibility of the purchaser towards his client to possess such knowledge that "or equivalent" properties are really equivalent in all significant points for safety.
