The primary purpose of a fire damper is to maintain the fire resistance of a fire separation; its inclusion in the HVAC system of a building necessarily affects the air handling characteristics of the system during the normal operation mode.

Fire dampers impose some resistance to air flow and therefore must be considered by the designer in determining the require flow rate (cfm) to each space.

Trolec distribute AMI fire and ceiling damper. They are available in a large quantity and models.

If you want to know which model you should order, visit their web site at: