CFM Calculator for 1500 Sq Ft Room
Find the exact CFM airflow needed for a 1500 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 1500 sqft spaces.
Airflow Requirements for 1500 Square Feet
A 1500 square foot room requires approximately 1500 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 37,500 BTU (3.13 tons), and the recommended round duct size is 20 inches at a quiet velocity of 700 FPM.
How We Calculated This
CFM = 1500 sqft × 1 CFM/sqft = 1500 CFM BTU = 1500 sqft × 25 BTU/sqft = 37,500 BTU Using 25 BTU per square foot as a general residential estimate. Actual load depends on insulation, climate, and sun exposure.
Diameter = √(4 × 1500 ÷ (π × 700)) × 12 ≈ 20 inches Based on 700 FPM velocity for quiet residential operation.
Related Guides
Other Room Sizes
Compare Top HVAC Equipment, Duct Supplies & Local Contractor Deals
Looking for ductwork materials, flexible duct bundles, airflow diagnostic meters, or contractor quotes? Browse current specials.