CFM Calculator for 750 Sq Ft Room
Find the exact CFM airflow needed for a 750 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 750 sqft spaces.
Airflow Requirements for 750 Square Feet
A 750 square foot room requires approximately 750 CFM of airflow for proper heating and cooling. This is based on the industry standard rule of 1 CFM per square foot. The estimated cooling load is 18,750 BTU (1.56 tons), and the recommended round duct size is 16 inches at a quiet velocity of 700 FPM.
How We Calculated This
CFM = 750 sqft × 1 CFM/sqft = 750 CFM BTU = 750 sqft × 25 BTU/sqft = 18,750 BTU Using 25 BTU per square foot as a general residential estimate. Actual load depends on insulation, climate, and sun exposure.
Diameter = √(4 × 750 ÷ (π × 700)) × 12 ≈ 16 inches Based on 700 FPM velocity for quiet residential operation.
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