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Silencing Mufflers

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), 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 end 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.

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).

Models

Reclassifying Mufflers
Model	Dimensions				Replacement
		A	B	C	Element
9070	in	3.13	1.63	1/8 NPT	900553
	mm	80	41
9071	in	3.13	1.63	1/4 NPT
	mm	80	41
9072	in	4.75	2.44	3/8 NPT	900554
	mm	121	62
9073	in	4.75	2.44	1/2 NPT
	mm	121	62
9074	in	6.25	3.31	3/4 NPT	900555
	mm	159	84
9075	in	6.25	3.31	1 NPT
	mm	159	84

Sintered Bronze Mufflers

EXAIR’s 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 UNF straight thread to fit most solenoid valves.)

Models

Sintered Bronze Mufflers
Model		Overall Length	Hex	Thread Size
		A	B	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	1.5	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	1.31	1 NPT
	mm	74	33
9087	in	3.25	1.69	1-1/4 NPT
	mm	83	43
9088	in	3.69	2	1-1/2 NPT
	mm	94	51
9089*	in	1.19	0.63	1/2″-20 UNF FEMALE
	mm	30	16

* Model 9089 for solenoid valves only

Straight-Through Mufflers

Straight-Through Silencing Mufflers are the low-cost way to reduce exhaust air noise in a work area. The straight-through bore is designed for high flow applications, assuring minimal back pressure. Straight-Through Silencing Mufflers feature a corrosion-resistant aluminium outer shell lined with sound absorbing foam for better noise reduction. The NPT threads make them easy to install directly into the exhaust port of air cylinders, valves, venturi pumps, vortex tubes and other air driven equipment. The typical noise reduction is up to 20 dB.

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

Models

Straight Through Mufflers
Model	Dimensions					Rated
		A	B	C	D	Flow
3914	in	4	1.5	1/4 MNPT	1/4 FNPT	22 SCFM
	mm	102	38			623 SLPM
3911	in	4.13	1.5	3/8 MNPT	3/8 FNPT	50 SCFM
	mm	105	38			1,416 SLPM
3913	in	9.75	2	3/4 MNPT	3/4 FNPT	73 SCFM
	mm	248	51			2,066 SLPM

Heavy Duty Mufflers

Straight-Through Silencing Mufflers are the low-cost way to reduce exhaust air noise in a work area. The straight-through bore is designed for high flow applications, assuring minimal back pressure. Straight-Through Silencing Mufflers feature a corrosion-resistant aluminium outer shell lined with sound absorbing foam for better noise reduction. The NPT threads make them easy to install directly into the exhaust port of air cylinders, valves, venturi pumps, vortex tubes and other air driven equipment. The typical noise reduction is up to 20 dB.

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

Models

Heavy Duty Mufflers
Model	Dimensions
		A	B	C	D
3903	in	1.81	0.81	0.63	1/4 FNPT
	mm	46	21	16
3907	in	4.5	2	1.5	3/8 FNPT
	mm	114	51	38