Working for a safer world

UL solves the safety, security and sustainability challenges of the 21st century. We empower trust and enable the safe adoption of innovation. Around the world, our employees share a common passion for our public mission to promote safe working and living environments for all people. UL tests, inspects, audits, certifies, verifies claims, advises and trains as well as provides software solutions. Our public charity, Underwriters Laboratories Inc., conducts independent research, community outreach, standards development and safety education.

After over a decade of research conducted by the UL Firefighter Safety Research Institute (FSRI), which is part of UL’s public charity, proved that a simple behavioral change, closing the door, could have potentially life-saving impact, spreading that message has become an essential part of advancing the UL mission, working for a safer world.

Learn more about UL FSRI and our work

A striking visual comparison of natural and synthetic furnishings.

Why is the Close Your Door message so important now? Because the fire environment has evolved.

As the materials inside our homes have changed, so has fire’s response. Synthetic construction materials, home furnishings, and contemporary layouts allow fire to spread and become toxic much faster. Like three-minutes-or-less-to-get-out faster.

But a closed door can slow the spread, reduce toxic smoke levels, improve oxygen levels and decrease temperatures dramatically. And in the modern fire environment, that could make a life-saving difference.

See for yourself what a closed door can do. The bedrooms in this video are side by side, adjacent to the burning living room.

A comparison of an open door bedroom and a closed door bedroom in a fire.

Join the Closed Door Crew

2,027 people have pledged to close their bedroom door. Will you?