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TEFC Size/Selection
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Horizontal TEFC Motor Silencers

Our TEFC Motor Silencers are used on the inlet end of all horizontal TEFC motors to quiet the sound radiating from the internal cooling fan. The fans on TEFC motors are typically the sound source for offending levels. These VA units are especially suited for applications where space behind machinery is limited or is important to preserve access. Please contact the factory for specific recommendations.

 

They can be adapted to any and all sizes of TEFC motors from 10HP through 4000HP motors. They typically provide between 35-50 dba of attenuation and do not restrict the required airflow of the motors on which they are installed. All of our VA Series silencers incorporate our Oxel spirals.

 

Please refer to the "TEFC Size/Selection" chart for proper sizing based on airflow and HP.

 

*This information is necessary if

holes are to be pre-punched. If

these specifications are not furnished, mounting flanges

must be drilled on the job by

installer.

 

Silencer construction is Aluminum.

Adapter fitting is steel.

Both have powder coat finish.

 

Each unit is complete with two

Oxeld square attenuating spirals,

mounting gasket, adapter fitting,

and inlet screen.

 

We will identify silencers by

area, fan, or motor number

only if it’s requested.

 

 

 

 

MODEL NUMBER

 
Dim

VA 77-2S

VA 88-2S

VA 99-2S

VA 1010-2S

VA 1212-2S

VA 1414-2S

VA 1420-2S

VA 1624-2S

VA 1826-2S

 

A

20”

22”

24”

26”

30”

34”

34”

38”

42”

 

B

11”

12”

13”

14”

16”

18”

18”

20”

22”

 

C

36”

38”

40”

42”

44”

52”

58”

64”

72”

INLET SIZE

(USER SPECIFIED)

D

 

 

 

 

 

 

 

 

 

O.D. OF FLANGE

(USER SPECIFIED)

E

 

 

 

 

 

 

 

 

 

 

F

12½”

13½”

14½”

15½”

17½”

19½”

19½”

24½”

28”

*SIZE OF BOLT CIRCLE

 

 

 

 

 

 

 

 

 

 

NUMBER & SIZE OF

MOUNTING BOLTS

 

 

 

 

 

 

 

 

 

 

*LOCATION OF 1ST

BOLT (0 DEG AT 3 O’CLOCK, ETC.)

 

 

 

 

 

 

 

 

 

 

 

   

 

 
     
ATTENUATION AND AIR FLOW

Model number

INSERTION LOSS AT 3FT.

AIR FLOW CFM

APPROX. WT. IN LBS.

B.B.

dBA

125

dB

250

dB

500

dB

1000

dB

2000

dB

4000

dB

@

0.50”

@

0.75”

SILENCER
ADAPTER

VA 77-2S

45

31

30

28

37

48

63

1420

1650

34

12

VA 88-2S

44

35

33

45

42

46

63

2600

2900

42

14

VA 99-2S

43

29

29

45

42

47

63

2900

3350

49

16

VA 1010-2S

46

29

32

39

45

51

63

4900

5600

54

18

VA 1212-2S

46

29

38

37

43

53

63

6500

7400

68

20

VA 1414-2S

46

28

35

34

36

49

63

7900

8200

85

24

VA 1420-2S

47

28

32

41

39

47

63

9400

10300

91

24

VA 1624-2S

52

31

34

38

47

49

62

12000

13800

126

50

VA 1826-2S

44

28

29

34

36

46

62

15000

16100

176

80

 

Above reading were taken during in-plant tests of Silencers. Air flow and pressure drop tests follow the joint

Standard ASHRAE 51-75 and AMCA 210-74. Attenuation tests made in large reverberant room, reading high level noise at selected frequencies, “open speaker”, and “attenuator in place”, using GENRAD 1565-A

And 1933 meters, calibrated with 1562-A calibrator before test. Broad band noise generated by GENRAD type 1390-A noise source.

 

 

       TYPE 1 ADAPTER                           TYPE 2 ADAPTER                          TYPE 3 ADAPTER

 

TAPER CONNECTS SILENCER TO

LARGER SIZE INLET ON MOTOR

ADAPTER IS STRAIGHT – NO TAPER

ADAPS LAGER SIZE SILENCER

TO SMALLER AIR INLET ON MOTOR

 

NOTE: Special adapters can be furnished for your requirements if you will supply a sketch. Adapters have internal acoustical treatment. Adapter types 1,2, and 3 will be punched to match the mounting flange of your equipment if you specify numbers and size of bolt holes and diameter of bolt circle. In ordering vertical silencers, VA series, specify location of first bolt, i.e. 0 degrees (3 o’clock) etc.

 

  

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Last modified: 10/15/09