The Register,air, cataloged under National Stock Number 4520-01-280-4331, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4520-01-280-4331
Item Name
Register,air
FSC / FSG
4520 / 45 — Space and Water Heating Equipment
Status
ACTIVE
Shape
SQUARE
Frame Type
FLAT
Frame Removability
REMOVABLE
Deflector Blade Operating Method
CONTROL BAR
Material
STEEL
Grille Quantity
1
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
SNTV1024000-027
3/9Design control — primary reference
Barber-Colman Co
No interchangeability data on file.
Other items in FSC 4520 — Space and Water Heating Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
NSN 4520-01-280-4331 is a Register,air, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
What are the specifications of 4520-01-280-4331?
Key specifications for 4520-01-280-4331: Shape: SQUARE; Frame Type: FLAT; Special Features: STANDARD OFF-WHITE FINISH; Frame Removability: REMOVABLE. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4520-01-280-4331 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.