MIL-DTL-22576A
3.4.2 Perforations. The bellmouth and bottom plate of each terminal shall be perforated with 0.068-inch
diameter holes on ¼-inch centers. The total opening of the holes shall be approximately 6.5 percent of area of the
sheet.
3.4.3 Burrs and irregularities. The edges of vanes, rings, collars, and other parts shall be free of burrs, tears, or
irregularities, which will tend to increase noise or turbulence in the air stream. In spinning or forming the bellmouth
and bottom plate some distortion of the holes in the perforated sheets is unavoidable.
3.4.4 Tears. There shall be no tears or split material between holes.
3.4.5 Cleaning. All brazed and welded joints shall be cleaned of flux and residue.
3.5 Label plates. Each terminal shall carry an identifying label. The label information may be pressed into the
throat piece, or a plate or a permanent corrosion-resistant label secured with adhesive may be attached to the throat
piece. The following information shall be shown by the label:
a.
Circular diffusing terminal
b.
Size
c.
Stock number
d.
Contract number or order number
e.
Manufacturer's name and Commercial and Government Entity (CAGE) code
3.6 Drawings. Drawings shall be as specified (see 6.2).
3.7 Shock. Unless otherwise specified (see 6.2), the terminal shall pass the high-impact shock tests specified in
MIL-S-901 for Grade A, Class I equipment.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on each size when a first article sample is
required (see 3.1). This inspection shall include the examination of 4.4 and the tests of 4.5 (see table I).
TABLE I. Test agenda.
Applicability of test to circular diffusing terminal
Tests
Requirement
Test
First article
Conformance
Shock
All
Shake
All
All
4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests of
table I.
4.4 Examination. Each of the sample diffusing terminals selected in accordance with 4.4.1 and 4.4.2 shall be
examined and measured to verify compliance with this specification. Examination shall be conducted as specified in
table II. Any diffusing terminal in the sample containing one or more defects shall be rejected.
4.4.1 Inspection lot. All diffusing terminals of the same size offered for delivery at one time shall be
considered a lot for purposes of sampling and inspection.
4.4.2 Sampling for examination. Sample diffusing terminals shall be selected at random from each lot in
accordance with ANSI/ASQ Z1.4 at Inspection Level II for the examination specified in 4.4.
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