National Stock Number
2540-21-921-3597
National Stock Number (NSN) 2540-21-921-3597, or NIIN 219213597, (diffuser,air,vehicular heating and ventilating) has an unknown assigned date. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 2 suppliers. Today, 2 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, there are no suppliers that are deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries.
This NSN is assigned to Item Name Code (INC) 45266. [A DEVICE FOR INSTALLATION IN VEHICLES USED IN VARYING DESIGNS TO EFFECT THE PROPER DISTRIBUTION OF VENTILATED OR HEATED AIR TO ASSURE TEMPERATURE EQUALIZATION, OR FOR THE DEFROSTING AND DE-ICING OF VEHICULAR GLASS SURFACES.].
This information was last updated on Jan 12, 2026.