Fire damper

A remotely automatically controlled device used to cover ventilation ducts or openings on the enclosing structure of a building, with a fire resistance rating evaluated according to the El criterion. Fire dampers include the following types:

Normally open fire damper (closes in case of fire);

Normally closed fire damper (opens in case of fire or after fire);

Double-action fire damper (closes in case of fire and opens after fire);