CFM Calculator for 200 Sq Ft Room
Find the exact CFM airflow needed for a 200 square foot room. Get recommended duct sizes, BTU load estimates, and HVAC sizing data for 200 sqft spaces.
Airflow Requirements for 200 Square Feet
Required CFM
200
Est. BTU Load
5,000
Cooling Tons
0.42
Duct Size
8"
A 200 square foot room requires approximately 200 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 5,000 BTU (0.42 tons), and the recommended round duct size is 8 inches at a quiet velocity of 700 FPM.
How We Calculated This
Step 1: CFM Requirement
CFM = 200 sqft × 1 CFM/sqft = 200 CFM Step 2: BTU Load Estimate
BTU = 200 sqft × 25 BTU/sqft = 5,000 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 × 200 ÷ (π × 700)) × 12 ≈ 8 inches Based on 700 FPM velocity for quiet residential operation.