Model: M21-4

Exhaust-intake Pneumatic Muffler

Properties:

Overall Length
34.000 inches
Inlet Connection Type
Flange
Overall Diameter
14.000 inches
Design Type
Dry
Inlet Connection Quantity
1
Coolant Type
Air
Muffler Design
Any acceptable
Body Shape
Round
Operating Position
Universal
Inlet Location
Centered on end of body
Inlet Projection Length
3.000 inches
Inlet Flange Shape
Round
Inlet Flange Mounting Provision And Quantity
8 holes
Inlet Flange Mounting Hole Diameter
0.750 inches
Inlet Flange Mounting Provision Spacing
Equally spaced on a 7.500 in. Bolt circle
Outlet Connection Quantity
1
Outlet Connection Type
Flange
Outlet Location
Centered on end of body
Outlet Projection Length
3.000 inches
Outlet Flange Shape
Round
Outlet Flange Mounting Provision And Quantity
8 holes
Outlet Flange Mounting Hole Diameter
0.750 inches
Outlet Flange Mounting Provision Spacing
Equally spaced on a 7.500 in. Bolt circle
Material
Steel
Material
Steel
Surface Treatment
Paint, primer, heat resistant
NSN
4330-00-800-1851
Part Number
M21-4
Description
Pneumatic Muffler,exhaust-intake
CAGE
11839

A noise control/filtering device of various sizes, shapes, designs, materials (metallic/non-metallic) and varied mounting configurations used to diffuse air blasts, lowers air velocity, reduce noise, filtration of airborne moisture and/or dust contamination, pressure equalization, speed control for air operated devices. For vehicular application see muffler, (as modified).

Part M21-4 NSN 4330-00-800-1851

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
37112
FIIG:
T135-C
Concept No.:
App. Key:
CD
Cond. Code:
2
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
125850
UFC:
61440
LTL:
RATING VARIABLE
LCL:
--
WCC:
594
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8487900080
  • SITC: 74999
  • End Use: Industrial machines, other
  • NAICS: 333999
  • USDA: 1

Freight Class: Machinery parts not containing electrical features, and not specified or included elsewhere in chapter 84, except ships' propellers

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