How does a foam fire-suppression system work? Watch these videos.

HOUSTON – A fire suppression system malfunctioned inside a United airlines hangar at Houston’s Bush Intercontinental Airport early Thursday morning.

Foam from the system then accidentally filled the hangar and the surrounding area.

MORE: Cleanup underway at Bush Intercontinental Airport after fire suppression foam leak

So how is a fire-suppression system supposed to work?

See the video below as 13 feet of foam fills a hangar at Edwards Air Force Base during a test in 2020.

See the video below from NASA Armstrong Flight Research Center during a test inside a hangar in 2015.