Bullard EVA Series, User Manual, Page: 6 / 25

GR50 Series Airline
Respirator User Manual
GR50 Air Pressure Table
GR50 Respirator Adjustment
10 11
Adjusting and Installing
Headband in Respirator Hood
(If using respirator with Bullard hard
hat, see page 12)
To change the headband size, unlock the four
pins from the sizing holes. Place the headband
on your head. Pull down, allowing headband to
expand until it feels comfortable. The headband
will automatically adjust to your size. Lock into
place by pushing the four pins into the sizing
holes (Figure 4).
NOTE
If using the optional 20RT ratchet head-
band suspension, refer to the instruction
sheet provided with the 20RT.
Adjust Crown Straps for
Vertical Fit
To improve suspension comfort, adjust crown
straps vertically by repositioning the crown strap
posts in the crown straps. Vertical adjustment
makes the headband ride higher or lower on
the wearer’s head. To adjust, push crown strap
post from slot, move to new slot, and snap in to
secure. Move key to desired vertical position.
Repeat for other crown strap post (Figure 7).
NOTE
If the hood rises off your head during use,
first verify proper air pressure, then select
a different hood for your application, or use
the optional chin strap.
Figure 3
Figure 4
8
64
7
63
7
62
7
61
7
60
7
59
7
58
7
57
6
56
6
55
6
54
6
53
7/8
3/4
5/8 1/2 3/8 1/8
7/8
3/4
5/8
1/2
SIZE
Figure 5
Crown strap
Crown
strap
post
Brow pad
S - Special or Critical User Instructions
Breathing Air Pressure Table
This table defines the air pressure ranges necessary to provide GR50 Series respirators with a volume of air that falls within the
required range of 6-15 cfm or 170-425 lpm according to U.S. Government regulations (42 CFR, Part 84, Subpart J, 84.150, Table 8).
1
2 3 4 5 6
Air Source Breathing Tube Assembly Air Supply
Hose
Air Supply Hose
Length (feet)
Maximum Number
of Hose Sections
Required Pressure
Range (psig air)
Stationary/
Portable Air
Compressor
or
Breathing Air
Cylinder
V30, V30B, V30S, V31,
V32, V33, V34, 37
V10
V5
25
50
100
150
200
250-300
25
50
1
2
3
4
5
5
1
2
14-15
15-18
19-24
23-29
25-34
31-39
12-18
19-23
V40, V40B, V40S, V41,
V42, V43, V44, V47
V10
V5
25
50
100
150
200
250-300
25
50
1
2
3
4
5
5
1
2
22-25
24-27
27-32
30-37
33-40
38-45
22-26
25-30
AC100030, AC100030B,
AC100030S, AC100031,
AC100032, AC100033,
AC100034, AC100037
V10
V5
25-50
75-150
175-300
25
50
2
3
3
3
3
5
1
2
55-65
60-70
65-75
55-65
56-69
DCC5040, DC041, DC5042,
DC5047
V10
V5
50
100
150
200
250
300
25
50
2
3
3
3
3
5
1
2
48-52
59-63
68-72
80-84
85-92
90-98
53-57
67-71
HC240030, HC240030B,
HC240030S, HC240031,
HC240032, HC240033,
HC240034, HC240037
V10
V5
25
50
100
150
200
250
300
25
50
1
2
3
4
4
5
5
1
1
59-61
63-65
68-70
73-75
77-79
80-82
84-86
65-66
68-69
Bullard Free-Air
®
Pump
V35, V35B, V35S V20 50
100
200
300
1
2
2
3
4-6
6-8
10-15
13-18
Frigitron ® 2000, Frigitron
2000B, Frigitron 2000S
V20 50
100
200
300
1
2
2
3
16-22
18-25
22-30
25-34