When to use: Use to verify public safety in-building radio coverage compliance per NFPA 1221 and IFC Section 510. Enter measured RSSI levels and coverage area/point data from a radio survey. The calculator checks inbound and outbound signal levels against the jurisdiction's minimum thresholds and verifies the required coverage percentage is met. Required for building permits in most jurisdictions with >10,000 sq ftgt;10,000 sq ft occupied floor area or fire code applicability.