CFM Calculator for 500 Sq Ft Room
Find the exact CFM airflow needed for a 500 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 500 sqft spaces.
Airflow Requirements for 500 Square Feet
A 500 square foot room requires approximately 500 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 12,500 BTU (1.04 tons), and the recommended round duct size is 12 inches at a quiet velocity of 700 FPM.
How We Calculated This
CFM = 500 sqft × 1 CFM/sqft = 500 CFM BTU = 500 sqft × 25 BTU/sqft = 12,500 BTU Using 25 BTU per square foot as a general residential estimate. Actual load depends on insulation, climate, and sun exposure.
Diameter = √(4 × 500 ÷ (π × 700)) × 12 ≈ 12 inches Based on 700 FPM velocity for quiet residential operation.
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