📐 NFPA 72 §17.7 Calculator

Detector Spacing & Coverage Calculator

Calculate smoke and heat detector spacing per NFPA 72 §17.7 and Table 17.6.3.1 — adjusted for ceiling height, slope, beams, and room geometry.

Detector Type

Ceiling Conditions

Room / Space Geometry

Results

Base Spacing (NFPA 72)30 ft
Adjusted Spacing30.0 ft
Coverage per Detector900 sq ft
Room Area2400 sq ft
Layout2 columns × 2 rows
DETECTORS REQUIRED
4
Smoke Detectors
Code References
NFPA 72 §17.7.3.3
Smoke: 30 ft max spacing, flat ceiling
NFPA 72 §17.7.3.7
Corridors ≤ 6 ft wide: single row allowed
NFPA 72 §17.6.3.1
Heat detector spacing table
NFPA 72 §17.6.3.5
Beam pocket adjustment rule