CFM per Ton
Standard 400 CFM per ton with humidity adjustments.
Example
You enter
- Tons 3
- Climate standard
You get
- Total CFM 1200
Checked against published worked examples from: ACCA.
Details, formula, and sources
Formula or tableStandard 400 CFM per ton for cooling (12000 BTU/hr per ton). Adjusted to 350 CFM per ton in high-humidity climates and 450 CFM per ton in dry climates per ACCA Manual S 2nd ed. guidance.
Source and editionACCA Manual S, 2nd edition by name.
Free accessACCA Manual S licensed; principles free in published engineering texts.
What governsEstimate. AHJ and licensed mechanical contractor govern. ACCA Manual J / D / S supersede rules of thumb.
API field namestons, climate, total_cfm
- 1 ton = 12000 BTU/hr AHRI definitionAHRI by name