CFM Calculator for 150 Sq Ft Room
Find the exact CFM airflow needed for a 150 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 150 sqft spaces.
Airflow Requirements for 150 Square Feet
A 150 square foot room requires approximately 150 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 3,750 BTU (0.31 tons), and the recommended round duct size is 8 inches at a quiet velocity of 700 FPM.
How We Calculated This
CFM = 150 sqft × 1 CFM/sqft = 150 CFM BTU = 150 sqft × 25 BTU/sqft = 3,750 BTU Using 25 BTU per square foot as a general residential estimate. Actual load depends on insulation, climate, and sun exposure.
Diameter = √(4 × 150 ÷ (π × 700)) × 12 ≈ 8 inches Based on 700 FPM velocity for quiet residential operation.
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