# NSN 4520-01-287-3991: Heater, Duct Type, Stationary

NSN 4520-01-287-3991 (also written 4520012873991; NIIN 01-287-3991) is a heater, duct type, stationary in Federal Supply Class 4520, Space and Water Heating Equipment. 3 manufacturer part numbers from 3 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4520-01-287-3991 (4520012873991)
- NIIN: 01-287-3991 (012873991)
- Item name: HEATER,DUCT TYPE,STATIONARY
- Federal Supply Class: [FSC 4520 Space and Water Heating Equipment](https://nsnexplorer.com/fsc/4520/)
- Federal Supply Group: [FSG 45](https://nsnexplorer.com/group/45/)
- Acquisition method suffix code: AMSC D: the data needed to compete the part is unavailable or cannot be obtained economically. (observed 2026-10-23)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAXX | MOUNTING TYPE | VENTILATION DUCT |
| ABAM | HEAT MEDIUM TYPE | AIR |
| ABGL | WIDTH | INCHES NOMINAL 42.000 |
| ACDC | CURRENT TYPE | AC |
| AEJZ | DEPTH | INCHES NOMINAL 8.000 |
| AMPS | CURRENT RATING IN AMPS | 1054.5 |
| BDXJ | HEATING ELEMENT TYPE | ELECTRIC NONIMMERSION |
| CQSJ | INCLOSURE MATERIAL | STEEL CORROSION RESISTING |
| CQXD | HEAT DELIVERY RATE | BRITISH THERMAL UNIT 156316.8 |
| ELEC | VOLTAGE IN VOLTS | 440.0 |
| FAAZ | PHASE | THREE |
| FEAT | SPECIAL FEATURES | NON-MAGNETIC |
| FREQ | FREQUENCY IN HERTZ | 60.0 |
| HGTH | HEIGHT | INCHES NOMINAL 16.750 |
| ZZZK | SPECIFICATION/STANDARD DATA | GOVERNMENT SPECIFICATION 81349--IL-H-22594 |
| ZZZT | NONDEFINITIVE SPEC/STD DATA | TYPE - |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| MIL-H-22594 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| TFZ-33M | 74924 | INDEECO LLC DBA INDEECO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| TFZ-33M | 74974 | BLAIR MERRIAM FRESH FRUIT AND PRODUCE CO INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-10 | [SPE8E926P1418](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4520012873991) | HEATER, DUCT TYPE, ST | VETERANS AEROSPACE LLC | $34,475.00 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4520012873991&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4520012873991
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- USAspending contract actions (each award above links to its record)
- All data is public U.S. government data; every row above links to its source record where one exists.

Canonical page: https://nsnexplorer.com/nsn/4520-01-287-3991/
JSON: https://nsnexplorer.com/api/nsn/4520-01-287-3991.json