New White Paper! Clean Agent Total Flooding Systems: Agent Adjustments for Continuous Mixing
A design tip exists that suggests using the Minimum Design Concentration (MDC) plus 15% extra clean agent combined with continuous air mixing ensures a proper hold time as required by NFPA 2001, 2025 edition. (All references to NFPA 2001 in this document refer to the 2025 edition unless otherwise noted.) An FSSA task group was assigned to verify whether this 15% additional clean agent provides a 10-minute hold time prediction for continuous mixing situations.
The task group used the simulation method given in NFPA 2001 to estimate the hold time for an enclosure with continuous air movement versus the predicted hold time in the same enclosure with air movement shut down at the time of discharge. This is the same method commonly used to fulfill NFPA 2001 system acceptance criteria.