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3 Ways Smoke Vents Close

 

Smoke vents are not easy to close! Unlike a roof hatch, the smoke vent natural position is open. The spring forces want to open the doors and need enough opening force by code to lift 10 lb/sq ft. On a typical 4ft by 8ft configuration, the closing force is 320 lbs, or about 160 lbs per door on a double leaf unit. You need the same 160 lbs of force to close the door.

3 Ways Smoke Vents Close

Options for closing the door include:

  1. Manual – from the rooftop. This may take a couple of strong people to put their weight on the unit until it latches.
  2. Winch – This option is frequently used in theatre applications where they are rigged down to the stage floor so you can crank the winch to close the doors.
  3. Motorized Control – These include open/close push button controls and electrical relay ties into the fire alarm.
Code also requires that a dampener be in place to slow the opening of the doors – without the dampener, the doors would open fast with a deadly force.

Nystrom understands the complexities with Smoke Vents, codes and applications.

For other relevant searches, you might want to try:

(10230) Vent
(05 50 00) Metal Fabrications
(07 72 00) Roof Accessories
(07 72 23) Relief Vents
(07 72 36) Smoke Vents
  (07 80 00) Fire and Smoke Protection
(07 87 00) Smoke Containment Barriers
(08 95 00) Vents
(23 33 13.19) Smoke-Control Dampers
(28 31 46) Smoke Detection Sensors