The problem: One door opening — the CT room entrance on a corridor that is also an escape route — is asked to stop X-rays, resist fire for 60 minutes, control smoke, and restrict access. These are four different engineering problems. Treating one certificate as proof of the others is the classic procurement error.

Radiation-shielding doors

Diagnostic X-ray, CT and radiotherapy rooms require doors with shielding matched to the physicist's room shielding calculation, expressed as lead equivalence (typically 1–3 mm Pb for diagnostic rooms; much more for therapy bunkers).

Construction: a steel or timber core door with continuous sheet lead bonded through the leaf, a lead-lined frame, and — critically — shielding continuity at the gaps: lead-lined architraves, overlapping rebates or labyrinth edges at the head and jambs, and a shielded threshold detail. The door leaf is only as good as its perimeter; a 2 mm Pb leaf with an unshielded 10 mm gap at the sill leaks radiation. Sliding and automated versions need operators rated for the high leaf mass (lead makes these doors very heavy — see Chapter 21), and the floor/wall structure must be checked for the load.

Evidence to demand: stated lead equivalence (mm Pb) of leaf and frame, the kVp range it was tested at, and shielding integrity of the frame/door junction detail. After installation, a radiation survey of the closed door by the medical physicist is the only real verification.

Fire-rated doors

Fire doors are tested as assemblies — leaf, frame, hardware, closers, glazing and seals together. The two dominant test regimes are not interchangeable:

  • UL 10C (North America): fire test of swinging door assemblies under positive pressure, simulating real fire conditions where hot gases press the door against its stops. Used with NFPA 80 for installation; ratings expressed in minutes (20/45/60/90/180).
  • EN 1634-1 (Europe): furnace test under the standard heating curve, feeding classification under EN 13501-2 as E (integrity), EI (integrity + insulation), EW (integrity + radiation control), with time in minutes (EI30, EI60, etc.). Smoke control adds the S/Sa/S200 classification from EN 13501-2 based on EN 1634-3 leakage testing.

Trade-off: insulation-rated (EI) doors are thicker and heavier than integrity-only (E) doors; smoke seals (Sa/S200) add friction that can prevent self-closing if closers are undersized. Glazed vision panels must be fire-rated glass within the tested size limits — a common failure is site-installed glazing larger than the tested specimen.

Evidence to demand: test report or certificate for the complete assembly at the required rating (UL 10C listing or EN 1634-1 report plus EN 13501-2 classification), covering the actual configuration (size, glazing, hardware, single/double leaf).

Smoke control

Smoke, not flame, causes most fire deaths. A fire rating without the S classification means the assembly was not tested for smoke leakage. For hospital corridors and compartmentation, specify Sa or S200 classified doorsets with verified ambient- and (for S200) hot-temperature leakage.

Security doors

Access control, forced-entry resistance (EN 1627 RC classes) or ballistic requirements are separate disciplines: they add mass, multi-point locking and reinforced frames. A security door is not fire-rated unless tested as such, and a fire door with an added heavy security lock may no longer match its tested assembly.

Where functions combine

A lead-lined fire door for a CT room on an escape route needs: shielding continuity + a fire test on a comparably constructed lead-lined assembly (lead content changes burn behaviour — do not assume a standard fire certificate covers it) + smoke classification + EN 16005-compliant automation if powered, with fail-safe release on alarm. Each function needs its own evidence, and the combined assembly must not contradict any individual certificate.

Common mistakes

  • Using one certificate (e.g. fire) to imply the others.
  • Unshielded frame gaps and thresholds in X-ray rooms.
  • Smoke seals added to a fire door whose closer cannot then latch it.
  • Field modifications (locks, glazing, kick plates) voiding the tested assembly.
  • Security hardware preventing the fire self-closing function.

Procurement checklist

  • Radiation: mm Pb equivalence, kVp basis, frame/threshold shielding details, post-installation survey
  • Fire: UL 10C listing or EN 1634-1 report + EN 13501-2 class (E/EI + minutes) for the exact assembly
  • Smoke: Sa/S200 classification (EN 1634-3 evidence)
  • Security: EN 1627 RC class if required, with fire release compatibility
  • Automation: EN 16005 compliance, fire-alarm fail state, battery backup
  • One responsible party for the combined assembly's compliance

Sources

  • D&D Hardware — CE vs UL fire test comparison (dndhardware.com)
  • BS EN 16005:2023 — power-operated doorsets including fire/smoke control applications (en-standard.eu)