# CFM Formula HVAC?

In order to calculate the HVAC CFM formula, you need to use a suitable formula for the spacing in question. The default formula is CFM = BTU/Hr / ( 1.08 x Temperature Difference). You can find other formulas by going to HVAC technician websites.
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Q&A Related to "CFM Formula HVAC?"
 to get the CFM you take the cross-sectional area ( length x width ) of the rectangular duct or pi x r^2 for round and multiply by the velocity ..example,,,,vel= 2 m/sec.. ,,,,,,50 http://answers.yahoo.com/question/index?qid=200907...
 1. Measure the length and width of a room where you need to calculate the required airflow. Multiply these together to get the square footage of the room, i.e. if the room is 10 ft http://www.ehow.com/how_5677999_calculate-cfm-hvac...