TM 9-2350-230-12
TABLE 2-6. OPERATION OF M8A3 AIR FILTER UNIT - CONTINUED
STEP
PROCEDURE
FIG/ITEM
AFTER OPERATION- Continued
12
Stow driver's air purifier-to-canister hose in spring clips.
13
Fasten spring clip over holes in air purifier housing.
PROTECTIVE LIFE OF GAS FILTERS
Record the duration of each chemical attack and the type of agent used.
With this record, the protective life of the M12A1 gas filter can be com-
puted using the following information. The operator will notify organi-
zational maintenance personnel to replace the gas filter when 100 replace-
ment units have been used.
GAS FILTER REPLACEMENT UNITS
Type Of Attack
Each air
CX and all
Ground-
delivered nerve
other agents
Duration
delivered
agent attack and
including
of
nerve
all blister agent
CK
unidentified
attack
agents
attacks except
(units
agents (units
(min)
(units used)
CX (units used)
used)
used)
2
1/2
1
10
6
4
1
2
20
12
6
1-1/2
3
30
18
8
2
4
40
24
10
2-1/2
5
50
30
12
3
6
60
36
14
3-1/2
7
70
42
16
4
8
80
48
18
4-1/2
9
90
54
20
5
10
100
60
An attack lasting less than 2 minutes is considered to have a duration
of 2 minutes. An attack lasting longer than 2 minutes but less than 4
minutes is considered to have a duration of 4 minutes. Similar consider-
ation is given to attacks up to 20 minutes.
To calculate the number of units used in an attack longer than 20
minutes, the following formula may be used: Multiply the duration
(number of minutes) by the number of units shown on line 1 of the
appropriate attack column and divide by 2. For example, a filter
exposed to a 30-minute air-delivered nerve agent attack would use 15
replacement units, as follows:
30 minutes x 1 unit = 15 units
2
2-25