Before SCBA, firefighters sometimes used this body feature as a smoke filter
What are their beards?

This industry drove much of the early development of respiratory protection technology
What is mining?
In 1945, this company introduced the Air-Pak, representing a transition toward modern SCBA
What is Scott Aviation?

Modern SCBA uses this component to store the breathing air
What is the cylinder?

You do this to check the battery level
What is press and hold the yellow button?

These two brothers developed a smoke helmet in the 1820s
Who were the Deane brothers?

These dangerous atmospheric conditions were major reasons mine-rescue teams needed breathing apparatus
What are toxic gases and oxygen-deficient atmospheres?

This British fire service adopted Proto equipment, helping move breathing-apparatus technology into firefighting
What is the London Fire Brigade?
Air cylinders contain an inner container made of this material
What is aluminum?
The Vibralert with activate at this remaining percentage
What is 33%?

The Deane brothers' smoke helmet was made primarily from this metal
What is copper?
This company's breathing apparatus became widely used by mine-rescue teams in Europe during the early 1900s
What is Dräger?
During WWII, advances in breathing equipment were heavily driven by the needs of this group
Who are aircraft crews?

The PASS alarm will activate after this amount of time has passed with no movement
What is 20 seconds?
The MMR will maintain positive pressure for flows up to this amount
What is 500lpm?

The Deane smoke helmet received air through this type of system
What is a hand pump?
Early Dräger equipment combined a small air cylinder with this component to remove CO₂
What is a CO₂ absorbent?

This type of SCBA recycles the user's breathing gas rather than exhausting it
What is a closed-circuit rebreather?

This standard consolidates SCBA, PASS, and other PPE standards
What is NFPA 1970?

When using the UEBSS, both firefighters will breathe off of this bottle first
What is the bottle with the lower psi?
The early smoke helmet was connected to an air supply through a hose made of this.
Flexible leather
In 1914 Siebe Gorman created this device
What is the Proto breathing apparatus?
In 1920, MSA introduced this respirator, which used compressed oxygen and a soda-lime scrubber
What is the MSA Gibbs respirator?
Approximately this many cubic feet of air are contained in the 45-minute cylinder.
What is 65 ft³?

Your Vibralert has activated but you have 3500psi left, the issue is most likely caused by this
What is primary first-stage regulator failure?