Decibel Ratings Taken to Understand the Difference Between the Loudness of Smoke Alarm Outside of an Open or Closed Door
As part of the Close Before You Doze full-scale experiments conducted in October, Steve Kerber, the Director of the UL Firefighter Safety Research Institute (FSRI), took measurements using a decibel meter in a bedroom with a sound level meter and recorded the difference between the loudness of a smoke alarm with the door open and the door closed. This portion of the experiment was conducted to help dispel the myth that a smoke alarm can not be heard at a reasonable level with the door closed - a common reason why people say they do not close their bedroom door before going to bed.
The data is shown in Table 1.
Watch this video to see how the experiments were conducted:
RESOURCE #1: Closeyourdoor.org