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BTH-B2 • Rectangular sound attenuators

SERVICES

PROJECTS

Rectangular
Galvanized steel
Mineral wool + resonance plates

Datasheet

Customized rectangular sound attenuators

Application

BTH-B2 silencers are designed to reduce sound generated from fans and airconditioning devices with maximum sound attenuation in the 250Hz octave band. The sound attenuation performance of the BTH-B2 silencers with build-in B2 attenuation splitters are superior to classical absorption attenuators on frequencies of 63 to 500 Hz with equal length and width of splitters and equal splitter pattern pitch. In other frequency bands the BTH-B2 silencers are also well adapted to ventilation and air-conditioning system acoustic requirements

Silencers with Splitter thickness d=100mm is suitable for smaller air flow rates as well as in the case where high degree attenuation is required in the high frequency range.
Splitter thickness of 200mm is suitable for large air flow rates as well as in the case where high degree attenuation is required in the low frequency range.
Standard version silencers with cellulose foil or galvanized steel sheet plates are suitable for velocities up to 20m/s between the splitters

Composition

The attenuation housing is made of galvanized sheet steel which complies with air tightness class C (ATC3)
Splitters with frames of galvanized steel and fillings with highly efficient absorption material are build into the housing
Filling exposed surface is protected with cellulose foil
They are designed to be incombustible class A1, Euroclass DIN EN 13501-1
B2 splitters are partly covered with galvanized steel strips
Strips of galvanized sheet steel or cellulose foil run along the splitter length L
The B2 splitter height en length are not interchangeable. The splitter L dimension shall always run in the direction of the propagation of sound

Order example

BTH-B2 BXHXL / d= ... / n= ...

Explanation

BTH-B2 : Silencer type with B2 Splitters with cellulose foil and sheet steel plates

BXHXL : Width X Height X Length

d=100 : Splitter thickness of 100mm

or

d=200 : Splitter thickness of 200mm

n= ... : Number of splitters

Prices

Other dimensions available on our website / upon request

Attenuation values BTH-B2 Splitter thickness d=100mm

L=500 mm - d=100										L=1500 mm - d=100
s [mm]	[Hz]									s [mm]	[Hz]
s [mm]	63	125	250	500	1000	2000	4000	8000		s [mm]	63	125	250	500	1000	2000	4000	8000
40	4	8	12	14	12	12	9	8		40	12	24	36	42	38	34	27	22
50	4	6	10	13	12	10	8	6		50	10	18	30	39	36	32	24	20
60	3	5	9	12	12	10	7	6		60	9	15	27	36	34	28	21	16
66.7	3	4	8	12	12	10	7	5		66.7	9	14	25	36	34	28	21	16
70	2	4	8	12	12	10	7	5		70	8	14	24	34	34	28	21	15
75	2	4	8	12	12	10	7	5		75	8	12	22	34	34	28	21	15
80	2	4	8	11	12	10	6	4		80	6	12	22	33	34	28	20	14
87.5	2	4	7	11	12	10	6	4		87.5	6	10	21	33	34	28	20	13
90	2	4	6	10	12	10	6	4		90	4	10	20	32	34	28	20	12
100	2	3	6	10	12	10	6	4		100	4	9	18	32	34	28	20	12

L=1000 mm - d=100										L=2000 mm - d=100
s [mm]	[Hz]									s [mm]	[Hz]
s [mm]	63	125	250	500	1000	2000	4000	8000		s [mm]	63	125	250	500	1000	2000	4000	8000
40	8	16	24	28	25	23	18	15		40	16	32	48	50	50	46	36	30
50	7	12	20	26	24	21	16	13		50	14	24	40	50	48	42	32	26
60	6	10	18	24	23	19	14	11		60	12	20	36	48	46	38	28	22
66.7	6	9	17	24	23	19	14	11		66.7	12	18	34	48	46	38	28	22
70	5	9	16	23	23	19	14	10		70	10	18	32	46	46	38	28	20
75	5	8	15	23	23	19	14	10		75	10	16	30	46	46	38	28	20
80	4	8	15	22	23	19	13	9		80	8	16	30	44	46	38	26	18
87.5	4	7	14	22	23	19	13	9		87.5	8	14	28	44	46	38	26	18
90	3	7	13	21	23	19	13	8		90	6	14	26	42	46	38	26	16
100	3	6	12	21	23	19	13	8		100	6	12	24	42	46	38	26	16

Attenuation values BTH-B2 Splitter thickness d=200mm

L=500 mm - d=200										L=1500 mm - d=200
s [mm]	[Hz]									s [mm]	[Hz]
s [mm]	63	125	250	500	1000	2000	4000	8000		s [mm]	63	125	250	500	1000	2000	4000	8000
60	2	7	15	17	18	16	10	8		60	8	21	45	50	50	46	32	24
75	2	7	14	14	13	10	6	5		75	8	21	40	44	39	28	18	15
100	2	6	12	12	10	7	4	4		100	8	18	34	38	32	21	14	12
125	2	4	10	10	10	6	4	4		125	8	14	28	32	30	20	14	12
150	2	4	8	10	9	6	4	4		150	4	12	26	28	27	16	10	10
175	2	4	8	10	9	6	4	4		175	4	11	25	28	27	16	10	10
200	2	3	8	10	9	6	4	4		200	4	9	24	28	27	16	10	10

L=1000 mm - d=200										L=2000 mm - d=200
s [mm]	[Hz]									s [mm]	[Hz]
s [mm]	63	125	250	500	1000	2000	4000	8000		s [mm]	63	125	250	500	1000	2000	4000	8000
60	5	14	30	34	35	31	21	16		60	10	28	50	50	50	50	42	32
75	5	14	27	29	26	19	12	10		75	10	28	50	50	50	38	24	20
100	5	12	23	25	21	14	9	8		100	10	24	46	50	42	28	18	16
125	5	9	19	21	20	13	9	8		125	10	18	38	42	40	26	18	16
150	3	8	17	19	18	11	7	7		150	6	16	34	38	36	22	14	14
175	3	7	17	19	18	11	7	7		175	6	14	34	38	36	22	14	14
200	3	6	16	19	18	11	7	7		200	6	12	32	38	36	22	14	14

Specifications

L = Length in mm
s = Distance between splitters in mm
Hz = Frequency band in Hertz
Sound attenuation capacities given in dB

Pressure losses BTH-B2 Splitter thickness d=100mm

L=500 mm - d=100												L=1500 mm - d=100
s [mm]	v (m/s)											s [mm]	v (m/s)
s [mm]	2	4	6	8	10	12	14	16	18	20		s [mm]	2	4	6	8	10	12	14	16	18	20
40	0	6	16	30	48	70	96	126	161	198		40	4	10	20	34	52	74	98	128	162	200
50	0	6	14	26	42	60	82	108	136	170		50	4	8	16	28	44	62	86	110	140	172
60	0	4	12	22	36	52	72	94	120	148		60	4	8	16	26	40	56	76	98	124	152
66.7	0	4	12	22	34	50	68	90	114	140		66.7	2	8	14	24	36	52	70	92	116	144
75	0	4	10	20	30	44	62	80	102	128		75	2	6	14	22	34	48	64	84	106	130
80	0	4	10	18	30	42	58	78	98	122		80	2	6	12	22	32	46	62	80	102	124
87.5	0	4	10	18	28	40	56	74	94	116		87.5	2	6	12	20	32	44	60	78	98	120
90	0	4	8	16	26	40	54	72	90	112		90	2	6	12	20	30	42	58	74	94	116
100	0	2	8	16	24	36	50	66	84	104		100	2	6	12	18	28	40	54	70	88	108

L=1000 mm - d=100												L=2000 mm - d=100
s [mm]	v (m/s)											s [mm]	v (m/s)
s [mm]	2	4	6	8	10	12	14	16	18	20		s [mm]	2	4	6	8	10	12	14	16	18	20
40	2	8	18	32	50	72	97	127	161	199		40	5	11	21	35	53	75	100	130	164	202
50	2	7	15	27	43	61	84	109	138	171		50	5	10	18	30	46	64	87	112	141	174
60	2	6	14	24	38	54	74	96	122	150		60	5	9	17	27	41	57	77	99	125	153
66.7	1	6	13	23	36	51	70	91	115	142		66.7	4	9	16	26	38	54	72	94	118	145
75	1	5	12	21	32	46	63	82	104	129		75	4	8	15	24	35	49	66	85	107	132
80	1	5	11	20	31	44	60	79	100	123		80	4	8	14	23	34	47	63	82	103	126
87.5	1	5	11	19	30	43	58	76	96	118		87.5	4	8	14	22	33	45	61	79	99	121
90	1	5	10	18	28	41	56	73	92	114		90	4	8	13	21	31	44	59	76	95	117
100	1	4	10	17	26	38	52	68	86	106		100	4	7	13	20	29	41	55	71	89	109

Pressure losses BTH-B2 Splitter thickness d=200mm

L=500 mm - d=200												L=1500 mm - d=200
s [mm]	v (m/s)											s [mm]	v (m/s)
s [mm]	2	4	6	8	10	12	14	16	18	20		s [mm]	2	4	6	8	10	12	14	16	18	20
60	0	6	16	32	50	72	100	130	164	204		60	4	10	20	34	52	76	102	132	168	206
75	0	6	14	28	44	64	88	116	146	180		75	4	8	18	30	48	68	90	118	150	184
100	0	4	12	24	38	54	76	98	126	154		100	4	8	16	26	40	58	78	102	128	158
125	0	4	10	20	34	48	66	88	110	136		125	4	8	14	24	36	52	70	90	114	140
150	0	4	10	18	30	44	60	78	100	124		150	2	6	12	22	32	46	64	82	104	128
175	0	4	10	18	28	42	58	76	96	118		175	2	6	12	20	32	44	60	78	98	122
200	0	2	8	16	26	38	52	68	86	106		200	2	6	12	18	28	40	54	70	88	110

L=1000 mm - d=200												L=2000 mm - d=200
s [mm]	v (m/s)											s [mm]	v (m/s)
s [mm]	2	4	6	8	10	12	14	16	18	20		s [mm]	2	4	6	8	10	12	14	16	18	20
60	2	8	18	33	51	74	101	131	166	205		60	5	11	21	36	54	77	104	134	169	208
75	2	7	16	29	46	66	89	117	148	182		75	5	10	19	32	49	69	92	120	151	185
100	2	6	14	25	39	56	77	100	127	156		100	5	9	17	28	42	59	80	103	130	159
125	1	6	12	22	35	50	68	89	112	138		125	4	9	15	25	38	53	71	92	115	141
150	1	5	11	20	31	45	62	80	102	126		150	4	8	14	23	34	48	65	83	105	129
175	1	5	11	19	30	43	59	77	97	120		175	4	8	14	22	33	46	62	80	100	123
200	1	4	10	17	27	39	53	69	87	108		200	4	7	13	20	30	42	56	72	90	111

Specifications

L = Length in mm
s = Distance between splitters in mm
Vs = Air velocity between splitters in m/s
Pressure drop vallues Dp are given in Pa
Pressure drop values can be reduced by 20% by adding 'option V' guides

Specifications

s = Distance between splitters in mm
B X H X L = Width X Height X Length in mm
d= Splitter thickness 100 or 200 in mm

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