ACOUSTICAL PERFORMANCE

NOISE REDUCTION EXPRESSED IN DECIBELS:

* Noise Reduction is the difference between the sound
  pressure levels between two rooms seperated by a
  wall containing a TRANSFER SILENCER.

ITEM
DESCRIPTION

OCVATE BAND NUMBERS

SPEECH INTERFERENCE
LEVEL (SIL)*
on noise reduction

SPEECH INTERFERENCE BANDS

 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

TS

23

31

36

40

51

57

61

52

49

CS

15

21

25

32

43

49

49

42

41

DS

11

15

18

22

27

36

39

33

28

GLASS

1/8" THICK

49

9

14

20

25

27

27

27

26

WINDOW

2 1/4" PANES
1/2" AIR SPACE

19

19

19

30

38

38

33

26

36

WINDOW

2 1/8" PANES
1-1/2" AIR SPACE

27

30

32

38

48

46

46

47

47

DOORS

THIN, NORMALLY HUNG

19

23

25

32

31

31

29

32

30

DOORS

THICK, TIGHT CLOSURE

22

25

28

34

35

39

41

45

38

WALLS

23

29

31

39

45

48

52

55

48

FLOORS and CEILINGS

* Usually provide satisfactory privacy except for very loud music, loud conversation, footsteps, bangings, etc.

AIR FLOW DATA - IN CFM

MODEL

STATIC PRESSURE LOSS,  INCHES H2O

0.05

0.10

0.15

0.20

0.25

143

121

178

221

252

282

145

172

257

320

365

410

147

244

363

444

507

568

303

265

380

470

542

608

305

380

548

674

775

870

307

530

768

943

1081

1215

423

370

535

660

759

850

425

530

768

944

1081

1215

427

741

1075

1320

1515

1703

CS

358

505

620

715

800

DS

205

286

350

410

460