Calculating Pipe CFM of Air


Cubic Ft of Air in Radiation



Cu. Ft. Per Sq Ft 

 Cast-iron wall


 Cast-iron column


 Cast-iron tube


Cast-iron thin tube (newer Style)


 Cast-iron radiant radiator


 Cast-iron baseboard (9" high)


 Cast-iron cabinet convector


 Unit  heater      


It may be required to use more than one main line vent per steam main in larger systems.

Multiple Main Line Vents

Disclaimer: The information found on this website is for informational purposes only. All preventive maintenance, service, installations should be reviewed on a per job situation. Any work performed on your heating system should be performed by qualified and experienced personnel only. Comfort-Calc or it's personnel accepts no responsibility for improper information, application, damage to property or bodily injury from applied information found on this website as it should be reviewed by a professional.