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Fire load density: category C1–C4
Enter the mass of each combustible in the room, the area it occupies and the clearance to the ceiling. The tool computes the fire load density and the C1–C4 category.
Quick answer
Total heat 67,000 MJ, fire load density 670 MJ/m²: room category C2 (High fire hazard).
Preliminary results
Total heat67,000MJ
Fire load density670MJ/m²
CategoryC2
| Step | Result | Basis |
|---|---|---|
| Paper, cartons5,000 × 13.4 | 67,000 MJ | — |
| Total heatQ = Σ Gᵢ·Qᵢ | 67,000 MJ | SP 12.13130 PL B · QCVN 06:2022 ⚠ |
| Fire load densityg = 67,000 / 100 | 670 MJ/m² | SP 12.13130 PL B · QCVN 06:2022 ⚠ |
| Category by gg = 670 | C3 | SP 12.13130 PL B · QCVN 06:2022 ⚠ |
| Upgrade check Q ≥ 0.64·g_T·H²0,64 × 1400 × 4.0² = 14,336 | Q ≥ … → C2 | SP 12.13130 PL B · QCVN 06:2022 ⚠ |
Sources and assumptions. Q = ΣGᵢ·Qᵢ, g = Q/S (S ≥ 10 m²); C1 > 2,200, C2 1,401–2,200, C3 181–1,400, C4 1–180 MJ/m²; C2, C3 upgraded when Q ≥ 0.64·g_T·H² (SP 12.13130 Annex B, applied for QCVN 06:2022/BXD categories) ⚠. Material heat values are reference values ⚠. C4 rooms also limit each load patch to ≤ 10 m² with spacing. ⚠ = code table value to be checked against the original standard. Preliminary results for material selection and budgeting; not a substitute for an approved fire protection design.
Fire load density thresholds
| Category | g, MJ/m² | Hazard |
|---|---|---|
| C1 | > 2,200 | Highest fire hazard |
| C2 | 1,401–2,200 | High fire hazard |
| C3 | 181–1,400 | Medium fire hazard |
| C4 | 1–180 | Low fire hazard |
Frequently asked questions
What category is a 100 m² paper store with 5 t of goods?
Q = 5,000 × 13.4 = 67,000 MJ, g = 670 MJ/m² → C3; with a small ceiling clearance (4 m: 0.64 × 1,400 × 16 = 14,336 < 67,000) it is upgraded to C2.
What is fire load used for?
The room C1–C4 category drives the building class (A–E), required fire resistance, compartment size and sprinkler and smoke control needs.