INTRODUCTION
2
P/N 595373-01 Rev C 202004
Figure 1-1 3M Scott Air-Pak X3 Pro SCBA respirator
Backframe and Harness Assembly
All model respirators described by these instructions feature an aluminum backframe equipped with a shoulder
harness and a waist pad made of Kevlar® fiber
1
and 3M™ Scotchlite™ Reflective Material
2
. The drag rescue loop
is a strap integrated into the shoulder harness of the SCBA to assist with rescuing a downed user. The optional
Universal Emergency Breathing Support System (UEBSS) connects to the waist pad and provides an accessory hose
to supply air to or receive air from another respirator user or to connect to an extended duration air supply hose
line.
3
Cylinder and Valve Assembly
The cylinder mounts on the Air-Pak X3 Pro CGA with a CGA-threaded hose coupling and on the Air-Pak X3 Pro
Snap-Change with a Snap-Change connector. Both types of cylinders are available as 2.2 (2216 psig), 4.5 (4500
psig), or 5.5 (5500 psig) pressures.
Dual-Redundant Pressure Reducer
The dual-redundant pressure reducer provides two pressure reducers in one, interconnected through an automatic
transfer valve. A reduction in primary pressure triggers an automatic transfer to the secondary circuit to provide an
uninterrupted supply of air. When the transfer occurs, the Vibralert end-of-service indicator alarm on the regulator
actuates (see “Vibralert” on page 3).
Full Facepiece with Head Harness
The full facepiece is available in specific models and sizes. Before use, the facepiece must be properly fitted as
outlined in "Appendix G: Facepiece Fitting” on page 59.
1. DuPont™ and Kevlar® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company.
2. 3M and Scotchlite are registered trademarks of 3M Company and its affiliates.
3. The Universal EBSS fittings are not compatible with older 3M Scott Air-Pak SCBAs. For SCBAs manufactured prior to
the NFPA 1981, 2018 edition standard, please contact 3M for upgrade options.
Dual-Redundant Pressure
Reducer
Cylinder & Valve
Assembly
Mask-Mounted
Regulator
Waist Pad
Backframe
Remote Pressure
Gauge
UEBSS Pouch
(optional)
Quick-Disconnect
(optional)
Shoulder Harness
Drag Rescue Loop
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