| Topic | NFPA 80 (USA) | IS 3614:2021 (India) | Common Points | Key Differences |
| Scope | Covers fire doors, shutters, dampers | Covers fire doors, doorsets, frames, sliding & rolling shutters | Both regulate fire door safety | IS has broader scope; NFPA includes dampers |
| Fire Rating | Integrity only | Integrity + Insulation (min 30 min) | Both require integrity testing | IS requires insulation; NFPA does not |
| Vision Panel | Allowed per listing | Strict size limits (0.12m² / 0.06m²) | Both allow only tested glazing | IS has strict limits; NFPA flexible |
| Hardware | Listed & labeled
mandatory |
Hardware must be supplied & certified by door manufacturer | Both require certified hardware | IS shifts liability to door manufacturer |
| Undercut | Approx 19 mm allowed | 19 mm
floor; 9 mm on sill |
Both similar limits | IS defines sill-specific limits |
| Intumescent | Only if required by listing | Mandatory for insulated doors; Smoke seals required | Both allow seals | IS makes intumescent seals compulsory |
| Frames | Labelled frames; per listing | Min 1.2 mm steel; max depth 350 mm | Both need approved frames | IS has detailed frame specifications |
| Inspection | Annual
mandatory |
No fixed annual inspection clause | Both require maintenance | NFPA mandates annual inspection |
