MIL-PRF-22594C(SH)
1.3 Part or identifying number (PIN). PINs to be used for electric, duct type heaters acquired to this
specification are created as follows:
M
22594
-
XX
X
Prefix for Military
Specification
Size (see
Type (see
Specification
Number
code below)
code below)
Size Code
Type Code
Size
Code
Type
Code
19EH
19
L
L
20EH
20
M
M
21EH
21
H
H
22EH
22
23EH
23
24EH
24
25EH
25
26EH
26
27EH
27
28EH
28
29EH
29
30EH
30
31EH
31
32EH
32
33EH
33
34EH
34
35EH
35
36EH
36
37EH
37
38EH
38
Examples: M22594-19H
M22594-26L
2
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