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Combination Pressure-Demand
Breathing Apparatus
Principles of Operation

  Operation of the Combination Pressure-Demand Breathing Apparatus is manual. It is an
approved, rated five-minute escape device. The pressure demand air-line respirator phase
is connected by an approved air-supply hose to a primary respirable air source; the worker
breathes from this source with the valve of the egress (exit) cylinder of the device turned off
until the user is ready to leave the working area. The user can leave, connected to the
primary air source, or can open the egress cylinder valve and have approximately five
minutes'; respiratory protection. When breathing from the air cylinder, the user can remain
connected to the primary air supply and exit, or can disconnect from the air source for
easier escape. If the primary air supply source should fail for any reason, the worker can
switch to the egress cylinder by turning a valve and escape to a safe atmosphere.

Approvals & Standards

  The Combination Pressure-Demand Breathing Apparatus is approved by the National
Institute for Occupational Safety and Health (NIOSH) Approval TC-13F-143-when the
device is supplied with respirable air from either the small escape cylinder or from a primary
compressed-air source; the approval requires that when connected to a primary air source,
an air inlet pressure between 65 and 85 psig must be maintained through an approved
hose length of between 8 and 300 feet. The approval requires that the compressed-air
cylinder be fully charged with air conforming to at least Grade D of Compressed Gas
Association Commodity Specification for Air, G-7-1; use limited to temperatures above -25
degrees F.

  Asbestos Abatement
  Hazardous Materials
  Oil and Gas

  Confined Space
  Oxygen Deficiency
  Toxic Atmosphere IDLH

Product Information
  Provides respiratory protection for personnel who must work in atmospheres that are
immediately dangerous to life and health (IDLH), such as in oil drilling and the
manufacturing and handling of certain chemicals. Serves as both a long-duration work
device and an escape device. Approved for respiratory protection for entry into, for
extended periods of work in and for escape from IDLH atmospheres. If used for entry into
IDLH atmospheres, the air-line must be connected before entry. The self-contained air
supply is approved for escape only. The apparatus features a lightweight shoulder
harness, which is foam-padded for extra comfort and a waist belt with a seat-belt-type
buckle. The handwheel of the cylinder valve is easy to grasp and operate. A short length of
neoprene hose makes it easy to connect and disconnect the air-supply hose. The inlet is
equipped with a Snap-Tite, Foster, Hansen or Duff-Norton quick-disconnect fitting.