The World Fire Safety Foundation
Chicago 2 of 6
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Click the play button to watch the film
The Foundation’s ‘Aquarium Test'
Why your smoke detector may go off when cooking
toast but remains silent in deadly smoldering fires)
(after the 20 second ad )

The UL Letters

Can UL resolve this problem? Read ‘The UL Letters’:

Has UL Deceived YOU?:  Chicago_1

UL - Flawed Testing?:  Chicago_2

The UL Letters:  Chicago_3

Chicago_4:  Misleading Marketing?

Chicago_5:  ‘Operation Save-A-Life’

Chicago_6:  The Terri Stewart Story

Has UL Deceived YOU?: Chicago 1

UL - Flawed Testing?:  Chicago 2

The UL Letters:  Chicago 3

Chicago 4:  Misleading Marketing?

Chicago 5:  ‘Operation Save-A-Life’

Chicago 6:  The Terri Stewart Story

Drengenberg - UL:
“We know if it’s a working smoke
 alarm, when the smoke hits that
 alarm, it will sound the alarm.”
John Drengenberg
Consumer Affairs Manager
Underwriters Laboratories
Bob Segall
Investigative Journalist
WTHR ‘13 Investigates’

Segall - ‘13 Investigates’:
“That just doesn’t make sense . . . 
 Is there any scientific explanation
 for why, in this real-world situation,
 we have smoke detectors not
 going off in a room full of smoke?”
Drengenberg - UL:
“I really don’t know!”
UL’s Testing Under Investigation
‘UL Testing Questioned'

The World Fire Safety Foundation
thanks WTHR’s Bob Segall for
making this video available on

‘UL Testing Questioned’

Watch this film on YouTube - 7 minutes
“In test, after test, after test, ‘13 Investigates’ and local fire
  departments have discovered, in rooms full of heavy smoke,
  ionization smoke alarms did not activate for a long time . . . 
  how did all the smoke alarms get one of these - a seal of
  approval from Underwriters Laboratories?”
Is UL’s Smoke Detector
‘Scientific Testing Flawed?
13 Investigates
UL Testing Questioned
Aug 2, 2007
“...the nations largest smoke alarm manufacturers defend their ionization
smoke alarms by simply pointing out
they have been tested and approved
by Underwriters Laboratories.”
“If there’d have been a family in there they’d have died.
  So how did all the smoke alarms get one of these,
  a ‘Seal of Approval’ from Underwriters Laboratories?”
UL’s ‘Seal of Approval’