The Euro Standard EN 1366-3, entitled “Fire resistance tests for service installations-Part 3, penetration seals” defines a penetration as “an aperture through a separating element for the passage of a service”. Service is defined as “a system to convey substance, for example a cable, conduit, pipe with or without any insulation, duct, chimney, or trunking; excluding air ventilation system, fire resistant ventilation ducts, fire resistant service ducts and shafts and smoke extraction ducts”.

The standard defines a penetration seal as “the system used to maintain the fire resistance of a separating element at the position where there is provision for services to pass through the separating element”.

See also EN 1366 : Part 4 for linear gap seals and EN 1366 : Part 5 relating to service shafts and ducts.