This specification establishes requirements for a coupling for use with low pressure, low and medium high temperature, air ducts.
Types - Couplings shall be of two types as follows:
Type I. - 450 Deg. F., NAS520; Type II. - 250 Deg. F., NAS521
Sizes - Couplings shall be of the sizes specified on the applicable NAS drawing.
AIA NAS522 History
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