Aspirating Smoke Detection Calculator

Design aspirating smoke detection (ASD) pipe network with sampling hole sizing per NFPA 72.

Input Parameters

Results

--
Area per Sampling Point
sq ft
--
Required Airflow
L/min
--
Est. Transport Time
sec
--
Design Status
Note: Aspirating smoke detection (ASD) systems per NFPA 72 Section 17.7.5 continuously sample air through pipe networks. Transport time must not exceed 60s for standard, 90s for very early warning applications. Hole balancing is critical.

Reference

Area per Hole = Total Area / Number of Holes NFPA 72 Max Coverage: Standard=900sf, Enhanced=400sf, VEWFD=200sf Pipe Volume = pi x r^2 x length Airflow = Pipe Volume / Max Transport Time Transport Time = Pipe Volume / Airflow Rate