Silencing Mufflers

  • Reduce work area noise
  • Eliminates exhaust air oil mist
  • High flow capacity
  • Low back pressure
  • Popular NPT sizes for easy retrofit for new and existing installations
  • Prevents open dead end pressures

EXAIR Silencing Mufflers help to reduce work area noise produced by air exhausting from cylinders, valves and other air powered equipment. Per OSHA standard 1910.95, a worker must not be exposed to sound levels above 90 dBA for any eight hour shift of a 40 hour work week. Silencing Mufflers help plants meet this OSHA requirement by reducing the sound to safe levels below 90 dBA. They also eliminate harmful dead ended pressures. Each style of Silencing Muffler shown has a high airflow capacity, with low back pressure. Popular NPT sizes are ideal for new and existing installations.

Sintered Bronze Mufflers

EXAIR’s new low cost Sintered Bronze Mufflers are easy to install in new and existing exhaust ports of valves, cylinders and other air powered equipment. Each Sintered Bronze Muffler is capable of passing a certain volume of air with minimal back pressure restriction so it doesn’t interfere with the operation of the cylinder or valve. When used with cylinders, the “Muffler Quick Pick” table helps you select the appropriate model based on the actual bore and stroke of the cylinder. (Note: Model 9089 has a 1/2″-20 straight thread to fit most solenoid valves.)

Model UOM Overall Length A Hex B Thread Size C
9080 in 0.72 0.31 #10-32
mm 18 8
9081 in 1.13 0.44 1/8 NPT
mm 29 11
9082 in 1.38 0.56 1/4 NPT
mm 35 14
9083 in 1.50 0.69 3/8 NPT
mm 38 18
9084 in 1.88 0.88 1/2 NPT
mm 48 22
9085 in 2.25 1.06 3/4 NPT
mm 57 27
9086 in 2.91 74 1 NPT
mm 1.31 33
9087 in 3.25 83 1 – 1/4 NPT
mm 43 2
9088 in 3.69 94 1 -1/2 NPT
mm 2 51
*9089 in 1.19 30 1/2″ – 20 Female
mm 0.63 16

*Model 9089 for solenoid valves only

Muffler will exhaust cylinder in 1/2 second for a cylinder charged to 100 PSIG.

Reclassifying Mufflers

Reclassifying Mufflers are an upgrade from Sintered Bronze Mufflers. They offer the best noise reduction – up to 35 dB. Reclassifying Mufflers eliminate oil mist. Exhaust air from cylinders and valves often contain oil mists that can contaminate the workers’ breathing air, affecting their health. Per OSHA standard 29 CFR 1910.10, a worker’s cumulative exposure to oil mist must not exceed 4.32 PPM (particles per million) in any eight hour shift of a 40 hour work week.

The patented wrap design of the removable element separates oil from the exhausted air so virtually no oil is released into the environment. Based on the intake of 50 PPM at 100 PSIG, the Reclassifying Mufflers reclassify and reduce the exhausted oil mist to .015 PPM. A reservoir where oil accumulates at the bottom can be drained by attaching a 1/4″ tube.

Each Reclassifying Muffler passes a certain volume of air with minimal back pressure restriction so it doesn’t interfere with the operation of the cylinder or valve. When used with cylinders, the “Muffler Quick Pick” table helps you select the appropriate model based on the actual bore and stroke of the cylinder.

Two tools are provided below to help you choose the model best suited to your application. The “Flow vs. Pressure Drop” performance curves show the amount of back pressure that builds as flow through the muffler is increased. For cylinders, use the “Muffler Quick Pick” table that helps you select a model that provides minimum back pressure restriction based on the actual bore and stroke of your cylinder (based on an acceptable exhaust time of 0.5 seconds).

Reduce noise from air powered equipment
Reclassifying Muffler Flow and Pressure Chart
Modell Description UOM Overall Length Width NPT Replacement Element #
9070 Reclassifying Muffler in 3.13 1.63 1/8 NPT 900553
mm 80 41
9071 Reclassifying Muffler in 3.13 1.63 1/4 NPT
mm 80 41
9072 Reclassifying Muffler in 4.75 2.44 3/8 NPT 900554
mm 121 62
9073 Reclassifying Muffler in 4.75 2.44 1/2 NPT
mm 121 62
9074 Reclassifying Muffler in 6.25 3.31 3/4 NPT 900555
mm 159 84
9075 Reclassifying Muffler in 6.25 3.31 1 NPT
mm 159 84

Straight-Through Mufflers

Straight-Through Silencing Mufflers feature a corrosion-resistant aluminum outer shell lined with sound-absorbing foam for better noise reduction. The typical noise reduction is up to 20 dB.

Model Description UOM A B C D E Rated Flow
3905 Straight-Through Muffler in 4 1.5 .5 1/4 NPT (Male) 1/4 NPT (Female) 22 SCFM
mm 102 38 13 623 SLPM
3911 Straight-Through Muffler in 4.13 1.5 .63 3/8 NPT (Male) 3/8 NPT (Female) 50 SCFM
mm 105 38 16 1415 SLPM
3913 Straight-Through Muffler in 9.75 2 .75 3/4 NPT (Male) 3/4 NPT (Female) 73 SCFM
mm 248 51 19 2066 SLPM

Flow rated at 1/2 PSIG back pressure

Caution: Operations approaching 32°F (0°C) could result in freeze-up due to moisture in the compressed air line.

Heavy Duty Mufflers

Heavy Duty Silencing Mufflers feature a corrosion-resistant aluminum outer shell with an internal stainless steel screen that protects valves and cylinders from contamination that could enter through the exhaust ports. This also keeps contaminants such as rust from being ejected at high speed from the exhaust port. The typical noise reduction is up to 14 dB.

Model Description UOM A B C D E
3903 Heavy Duty Muffler in 1.81 0.81 .44 63 1/4 NPT (Female)
mm 46 21 11 16
3907 Heavy Duty Muffler in 4.5 2 .75 1.5 3/4 NPT (Female)
mm 114 51 19 38

Caution: Operations approaching 32°F (0°C) could result in freeze up due to moisture in the compressed air line.