Air Supply to Boiler House
Calculator tool for determining adequate combustion air supply requirements for boiler rooms based on fuel input and regulatory standards (ASME, NFPA, BOCA, SBCCI)
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Required Air Opening Area (ASME)-- sq. in.
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Required Opening Area (Outdoor)-- sq. in.
Required Opening Area (Vertical Ducts)-- sq. in.
Required Opening Area (Horizontal Ducts)-- sq. in.
Calculator
Inputs
Results
Required Opening Area (Outdoor)-- sq. in.
Required Opening Area (Vertical Ducts)-- sq. in.
Required Opening Area (Horizontal Ducts)-- sq. in.
Calculator
Inputs
Results
Required Opening Area (Outdoor)-- sq. in.
Required Opening Area (Vertical Ducts)-- sq. in.
Required Opening Area (Horizontal Ducts)-- sq. in.
Calculator
Inputs
Results
Required Opening Area (Outdoor)-- sq. in.
Required Opening Area (Vertical Ducts)-- sq. in.
Required Opening Area (Horizontal Ducts)-- sq. in.
Calculator
Inputs
Results
Required Opening Area (Outdoor)-- sq. in.
Calculator
Inputs
Results
Required Gross Opening Area-- sq. in.
| Standard | Outdoor Opening | Vertical Ducts | Horizontal Ducts | Min. Duct Dimension | Key Requirements |
|---|---|---|---|---|---|
| ASME CSD-1 & VI | 1 sq.in. per 2000 Btu/hr | — | — | N/A | 1 required opening |
| NFPA 54 (Gas) | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 2000 Btu/hr | 3 inches | 2 openings required, damper interlocked |
| NFPA 31 (Oil) | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 2000 Btu/hr | 3 inches | 2 openings required |
| BOCA (All Fuels) | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 2000 Btu/hr | 3 inches | 2 openings required, damper interlocked |
| SBCCI (Gas/Oil) | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 4000 Btu/hr | 1 sq.in. per 2000 Btu/hr | 3 inches | 2 openings required |
| SBCCI (Solid Fuels) | 2 sq.in. per 1000 Btu/hr | — | — | 3 inches | 2 openings required |