PA20 Series Powered Air-Purifying Respirator
PA1/PA2 Blower Assembly User Manual
PA1/PA2 - Principle of Operation
The PA20 Powered Air-Purifying Respirator (PAPR) System
is supplied in four parts:
1. The Blower Assembly (Part No. PA1, or Part No. PA2)
which includes:
PA1BU, or PA2BU Blower Unit with Battery
PA1FG Filter/Gasket
PA1SB Belt Assembly
PA1AFI Air Flow Indicator
User Instructions
2. The hood with headband suspension and/or hard hat,
or loose fitting facepiece. The following hood models
may be used with the PA1BU or PA2BU blower unit: (See
listing of hoods for materials and packaging quantities.)
20TJ Hood
20TP Hood with Solvent-Resistant lens
20TIC Hood with Inner Bib
20TPC Hood with Inner Bib and Solvent-Resistant Lens
20TICH Hood for use with Bullard Hard Hat
20TICS Hood with Taped and Sealed Seams
20SIC Hood with Taped and Sealed Seams
20SICH Hood with Taped and Sealed Seams for use
with Bullard Hard Hat
20LFM Loose-Fitting Facepiece Hood, Small-Medium*
20LFL Loose-Fitting Facepiece Hood, Large*
*Uses PA20LFBT Breathing Tube
3. The breathing tube. Choose PA1BT for hoods and
PA20LFBT for loose fitting facepieces
4. The Battery Charger. Both standard and quick chargers
are available.
The high efficiency air-purifying element must be mounted
inside the blower body. The blower unit draws in
contaminated air through the filter. The filtered air is blown
into the wearer’s hood through the breathing tube. A flow
indicator is provided to check that there is an adequate
volume of air available to the wearer prior to use.
The units are designed for use at temperatures from 32º F
to 90º F (0º C to 32º C).
The system is designed to operate at a minimum air flow of
7.5 cubic feet of air per minute (210 liters per minute) in
the hood under normal use. In a heavily contaminated
environment, the battery life may be reduced due to
clogging of the filter.
The PA1BU system (only) is fitted with an audible alarm
which will sound due to low battery power.
NIOSH Approval No. TC-19C-154, Type C
The same headpieces approved for use with the PA20
Series of Powered Air-Purifying Respirators are also
approved for use with the CC20 Series of Supplied Air
Respirators. CC20 Series Respirators provide a high level
of respiratory protection and user comfort over long work
periods, in a wide variety of hazardous environments.
The CC20 SAR air flow control devices and other
components are described in the CC20/PA20 Series User
Manual.
Principle o
f Oper
a
tion
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