NFPA 13 gives direction.  In the 2019 edition, look at 16.12.

Craig Prahl | Jacobs | Fire Protection SME – Special Hazards | 
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From: Tim Easter <[email protected]>
Sent: Thursday, September 19, 2024 6:38 AM
To: [email protected]
Subject: [EXTERNAL] [Sprinklerforum] Fdc

When is fdc required? I have 3" riser in existing building less than 3600sf.

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