Interior length of the protected room in feet. Measure to inside face of walls, not structural grid. Typical server rooms: 20-80 ft. Measure to inside face of walls.

Interior width of the protected room in feet. Measure to inside face of walls, not structural grid. Typical server rooms: 15-50 ft.

Floor-to-ceiling height of the protected room in feet. Use the height to the lowest ceiling obstruction if a drop ceiling is present. Typical: 10-14 ft for server rooms, 8-10 ft for offices.

Clean agent type. FM200 (HFC-227ea) and Novec1230 (FK-5-1-12) are halocarbon agents with 10 s discharge. IG541 (Inergen) and CO2 are inert gases with 60 s discharge. Per NFPA 2001.

Ambient room temperature in degrees Fahrenheit. Affects agent specific volume and required quantity. NFPA 2001 reference condition is 70 F. Typical: 68-75 F for conditioned spaces. If omitted, defaults to 70 F.

Fire hazard class per NFPA 2001. Class A: ordinary combustibles (paper, wood). Class B: flammable liquids. Class C: energized electrical equipment. Determines hold time. If omitted, defaults to Class A.

Override design concentration as a percentage. If omitted, uses NFPA 2001 default for the selected agent (e.g. 7.0% for FM200, 5.3% for Novec1230). Higher values may be required for specific fuels.

Volume of permanent obstructions (solid equipment, structural columns) to subtract from gross room volume in cubic feet. Do not subtract open racks or permeable objects. Subtract raised floor void, large equipment, etc. If omitted, defaults to 0 (no obstructions).