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
Required CFM
750
Est. BTU Load
18,750
Cooling Tons
1.56
Duct Size
16"
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
Step 1: CFM Requirement
CFM = 750 sqft × 1 CFM/sqft = 750 CFM Step 2: BTU Load Estimate
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.
Step 3: Duct Size
Diameter = √(4 × 750 ÷ (π × 700)) × 12 ≈ 16 inches Based on 700 FPM velocity for quiet residential operation.