MILWAUKEE TOOL
13135 West Lisbon Road • Brookfield WI 53005 • 262-781-3600
3/10/2022
29 CFR 1926.1153
Milwaukee® OSHA® Compliance Solutions
To Whom It May Concern,
Milwaukee®, in partnership with the Industrial Hygiene Sciences, LLC, has conducted testing on the Milwaukee
SDS Plus HAMMERVACTM Dedicated Dust Extractors. Results show that the 2915-DE HAMMERVACTM
Dedicated Dust Extractors are below the Permissible Exposure Limit (PEL) as described by OSHA 29 CFR
1926.1153 assuming they are used in accordance with manufacturer’s instructions Testing results and procedures
are outlined below:
Unit Tested
Average
Holes Drilled
Average Sample
Duration (Minutes)
Averate % Silica
(Quartz) in Sample
Average Respirable
Cyrstalline Silica
Concentration (µg/m3)
OSHA PEL in
2912.1153
2915-DE
50
60
12.5%
17 µg/m3 TWA
50 µg/m3 over an 8
hour period
• All drilling was performed overhead using a Milwaukee Rotary Hammer and a Milwaukee
HAMMERVAC
TM
Dedicated Dust Extractor.
• The hole size was 5/8” in diameter and 4 ½” deep.*
• Test procedure included both the drilling of holes and a method of emptying the dust box:
o The dust box on the extractor was emptied every 3 holes
o The dust box and filter were emptied by being connected to a dust extraction system
• Concrete blocks were poured from a 5000 PSI concrete mix.
• The room size 10ft x 16ft x 16ft
• The room surfaces were wiped down between trials to ensure accurate measurements
• Samples were analyzed using OSHA ID-142 by the Wisconsin Occupational Health Laboratory, an AIHA
Accredited laboratory. The sampling method used meets the definition of respirable crystalline silica in
1926.1153 (a) and Appendix A of the OSHA Respirable Crystalline Silica Standard (1926.1153)
• The Time Weighted Average (TWA) was calculated assuming zero exposure to respirable crystalline
silica for the non-sampled portion of a 480 minutes (8 hour) shift. Longer exposure times, assuming that
the dust exposures would be similar to the those collected in these trials, would likely result in higher
TWAs. Factors that would affect actual user exposures include, but are not limited to, the ventilation and
air flow patterns in the work space, the presence of other respirable silica dust generating activities in the
area, the frequency of and method used to empty the extractor, and the number and depth of the holes
drilled.
*A 5/8” drill bit reflects the highest dust generating application, suggesting that other bit sizes would also be
compliant when using the Milwaukee 2915-DE HAMMERVACTM Dedicated Dust Extractor.
• Details on how to properly implement the 2915-DEas part of a completed exposure plan are outlined
below.
Maximum Number of Holes per Day**
Frequency of Need to Empty Dust Box***
Hole Depth
Hole Diameter
3/16”
¼”
3/8”
½”
5/8”
¾”
7/8”
1”
1-1/8”
1”
150
84
38
21
14 9 7 5 4
1-1/2”
100
56
25
14 9 6 5 4
3
2”
75
42
19
11 7 5 3 3 2 2-1/2”
60
34
15 8 5 4 3 2 2
3”
50
28
13 7 5 3 2 2 1
3-1/2”
43
24
11 6 4 3 2 2 1
4”
38
21 9 5 3 2 2 1 1 4-1/2”
33
19 8 5 3 2 2 1
1
5”
30
17 8 4 3 2 1 1
1
5-1/2”
27
15 7 4 2 2 1 1 1 6”
25
14 6 4 2 2 1 1
1
6-1/2”
23
13 6 3 2 1 1 1
1
7”
21
12 5 3 2 1 1 1 1 7-1/2”
20
11 5 3 2 1 1 1
1
8”
19
11 5 3 2 1 1 1
1
It is the responsibility of the user to operate the tool in accordance with manufacturer’s instruction. For the latest
listings of approvals, visit milwaukeetool.com. For technical or service assistance, contact Milwaukee Customer
Service at 1-800-729-3878.
* These calculations are offered for reference and are calculated values based on previously recorded test data.
** The user must drill the same number or fewer holes than those listed above for the given application in order to
be considered compliant with the objective data clause of 29 CFR 1926.1153 OSHA regulation on crystalline
silica dust.
*** The dust box needs to be emptied out at or before the numbers specified above in order to be considered
compliant with the objective data clause of 29 CFR 1926.1153 OSHA regulation on crystalline silica dust.
Hole Diameter
Hole Depth
3/16”
¼”
3/8”
½”
5/8”
¾”
7/8”
1”
1-1/8”
1”
7,400
4,163
1,850
1,041
666
463
340
260
206
1-1/2”
4,933
2,775
1,233
694
444
308
227
173
137
2”
3,700
2,081
925
520
333
231
170
130
103
2-1/2”
2,960
1,665
740
416
266
185
136
104
82
3”
2,467
1,388
617
347
222
154
113
87
69
3-1/2”
2,114
1,189
529
297
190
132
97
74
59
4”
1,850
1,041
463
260
167
116
85
65
51
4-1/2”
1,644
925
411
231
148
103
76
58
46
5”
1,480
833
370
208
133
93
68
52
41
5-1/2”
1,345
757
336
189
121
84
62
47
37
6”
1,233
694
308
173
111
77
57
43
34
6-1/2”
1,138
640
285
160
102
71
52
40
32
7”
1,057
595
264
149
95
66
49
37
29
7-1/2”
987
555
247
139
89
62
45
35
27
8”
925
520
231
130
83
58
42
33
26
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