STABILIZED
This specification establishes the 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 °F, NAS520
Type II – 250 °F, NAS521
Sizes. Couplings shall be of the sizes specified on the applicable NAS drawing.
AIA NAS522:2022 History
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