CFM Calculator for 100 Sq Ft Room
Find the exact CFM airflow needed for a 100 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 100 sqft spaces.
Airflow Requirements for 100 Square Feet
A 100 square foot room requires approximately 100 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 2,500 BTU (0.21 tons), and the recommended round duct size is 6 inches at a quiet velocity of 700 FPM.
How We Calculated This
CFM = 100 sqft × 1 CFM/sqft = 100 CFM BTU = 100 sqft × 25 BTU/sqft = 2,500 BTU Using 25 BTU per square foot as a general residential estimate. Actual load depends on insulation, climate, and sun exposure.
Diameter = √(4 × 100 ÷ (π × 700)) × 12 ≈ 6 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.