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S21L — HEATER,VENTILATION,DUCT TYPE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

S21L: HEATER,VENTILATION,DUCT TYPE.

The HEATER,VENTILATION,DUCT TYPE is a the manufacturer industrial component. Key specifications include material: STEEL, overall_width: 28.000 INCHES NOMINAL IN, overall_length: 122.0 MILLIMETERS NOMINAL MM, special_features: FLAP STAY/LID STAY WITH LOCK, style_designator: FRICTION TYPE, mounting_hole_type: COUNTERSUNK. This part is cataloged in the U.S.

Government catalog under NSN 4520-00-273-1060, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
S21L
NSN: 4520-00-273-1060
NIINs: 002731060, 015707896, 016895092
FSC: 4520 — Space and Water Heating Equipment
CAGE: 38450 — ENGINEERED COIL COMPANY DBA ENGINEERED COIL CO DIV DRS MARLO COIL (USA)
SPECIFICATIONS
materialSTEEL
overall_width28.000 INCHES NOMINAL IN
overall_length122.0 MILLIMETERS NOMINAL MM
special_featuresFLAP STAY/LID STAY WITH LOCK
style_designatorFRICTION TYPE
mounting_hole_typeCOUNTERSUNK
operational_directionLEFT-HAND
mounting_hole_diameter3.3 MILLIMETERS NOMINAL MM
part_name_assigned_by_controlling_agencyLID STAY
NSN4520-00-273-1060
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available HEATER,VENTILATION,DUCT TYPE TITLE COMPONENT PN S21L MFR HEATER,VENTILATION,DUC
KEY FEATURES
•
HEAT MEDIUM TYPE: HOT WATER OR STEAM
•
INCLOSURE MATERIAL: STEEL
•
DUCT HEIGHT: 3.250 INCHES IN
•
HEAT OUTLET QUANTITY: 1
•
DUCT WIDTH: 6.000 INCHES IN
•
HEAT DISCHARGE OUTLET TYPE: STATIONARY
•
HEAT DELIVERY DIRECTION: HORIZONTAL
•
HEIGHT: 6.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAT MEDIUM TYPEHOT WATER OR STEAM
INCLOSURE MATERIALSTEEL
DUCT HEIGHT3.250 INCHES IN
HEAT OUTLET QUANTITY1
DUCT WIDTH6.000 INCHES IN
HEAT DISCHARGE OUTLET TYPESTATIONARY
HEAT DELIVERY DIRECTIONHORIZONTAL
HEIGHT6.250 INCHES NOMINAL IN
SPECIAL FEATURESTUBE HAS 36 FINS PER FT; CONFORMS TO MIL-H-16235C
SURFACE TREATMENTZINC
SUBSTITUTES & CROSS-REFERENCES 3
NSTDSIZES21LReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
S3802-66970S21LSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S3802-66970-21LReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S21L?
S21L is a HEATER,VENTILATION,DUCT TYPE.
What parts can replace S21L?
There are 3 known substitutes for S21L: NSTDSIZES21L, S3802-66970S21L, S3802-66970-21L. Substitute compatibility should be verified for your specific system.
What is the NSN for S21L?
S21L is cataloged in the U.S. Government catalog under NSN 4520-00-273-1060. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.