The Damper,fire Control, cataloged under National Stock Number 4520-01-301-4312, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Peter Kalby Co Inc the. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-301-4312 |
| Primary Part Number | 250-6/6 |
| Item Name | Damper,fire Control |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Peter Kalby Co Inc the |
| Status | ACTIVE |
| General Characteristics Item Description | 6.000 IN. BY 6.000 IN. SIZE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 250-6/6 PRIMARY | Peter Kalby Co Inc the (USA) |
NSN 4520-01-301-4312 is a Damper,fire Control, manufactured by Peter Kalby Co Inc the, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-301-4312 has 1 manufacturer part number on file: 250-6/6 (Peter Kalby Co Inc the).
2 possible matches (shared part number, not a government interchangeability claim): 4720-01-540-6604, 5330-01-561-8847. Verify interchangeability with system specifications before substitution.
Key specifications for 250-6/6: General Characteristics Item Description: 6.000 IN. BY 6.000 IN. SIZE IN. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.