CA

The stated differential pressures for circular silencers correspond to the values for smooth pipes. Deviations, if any, are of no practical relevance.

For ductwork calculation, if the length of a circular silencer is included in the total length of the ductwork, no extra length must be added.

CA050 (insulation thickness 50 mm), insertion loss

Nominal size	Nominal length	Centre frequency fm [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
Nominal size	Nominal length	De
Nominal size	mm	Hz
100	500	3	5	8	14	23	30	18	13
100	1000	4	9	15	27	42	50	43	25
125	500	3	4	7	12	21	23	12	10
125	1000	4	7	12	23	38	42	29	20
160	500	2	3	6	10	18	17	8	8
160	1000	3	5	9	19	34	30	18	15
200	500	1	2	5	9	16	13	5	6
200	1000	2	4	8	16	31	22	12	11
250	500	1	2	4	8	14	10	3	4
250	1000	2	3	6	14	28	17	8	9
250	1500	2	4	8	19	39	23	13	12
315	500	1	1	3	7	12	7	2	3
315	1000	1	2	5	12	25	13	5	6
315	1500	2	3	7	17	35	17	9	9
400	500	1	1	3	6	11	6	1	2
400	1000	1	2	4	10	22	10	3	5
400	1500	1	2	6	14	31	13	6	7

CA100 (insulation thickness 100 mm), insertion loss

Nominal size	Nominal length	Centre frequency fm [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
Nominal size	Nominal length	De
Nominal size	mm	Hz
100	500	4	9	12	18	35	33	26	14
100	1000	5	17	24	35	50	50	47	25
125	500	4	7	10	17	31	26	19	11
125	1000	5	14	21	32	48	44	33	20
160	500	3	6	9	15	28	20	13	8
160	1000	5	11	18	30	42	33	22	15
200	500	3	5	8	15	25	16	9	7
200	1000	4	9	16	28	38	26	16	12
250	500	2	4	7	14	21	13	6	5
250	1000	3	8	14	26	33	21	11	9
250	1500	4	11	21	37	41	27	15	12
315	500	2	3	6	13	18	10	4	4
315	1000	3	6	12	24	29	16	8	7
315	1500	3	9	18	34	35	21	10	9
400	500	1	3	6	12	17	8	3	3
400	1000	2	5	11	23	25	12	5	5
400	1500	3	7	16	32	31	16	7	7
450	1000	2	5	10	22	23	11	4	5
450	1500	2	6	15	31	29	14	6	6
500	1000	2	4	10	21	22	10	4	4
500	1500	2	6	14	30	27	13	5	6
560	1500	2	5	13	29	25	11	4	5
630	1500	2	5	12	28	23	10	4	4
710	1500	2	5	11	27	22	9	3	4
800	1500	2	4	11	26	20	8	2	3

CA, differential pressure

Nominal size	V		Nennlänge [mm]
Nominal size	V		500	1000	1500
Nominal size	V		∆pst
Nominal size	l/s	m³/h	Pa
100	30	108	2	2
100	60	216	4	8
100	75	270	6	12
100	90	324	8	18
125	50	180	2	2
125	95	342	4	6
125	120	432	6	10
125	145	522	6	14
160	80	288	2	2
160	155	558	2	6
160	195	702	4	8
160	235	846	6	10
200	125	450	2	2
200	245	882	2	4
200	310	1116	4	6
200	370	1332	4	8
250	195	702	<2	<2	<2
250	385	1386	<2	4	4
250	485	1746	2	4	6
250	580	2088	4	6	8
315	310	1116	<2	<2	<2
315	615	2214	<2	2	4
315	770	2772	<2	4	4
315	925	3330	2	4	6
400	500	1800	<2	<2	<2
400	995	3582	<2	<2	2
400	1245	4482	<2	2	4
400	1495	5382	<2	4	4
450	630	2268		<2	<2
450	1260	4536		<2	<2
450	1575	5670		<2	4
450	1890	6804		2	4
500	780	2808		<2	<2
500	1560	5616		<2	2
500	1950	7020		2	2
500	2335	8406		2	4
560	980	3528			<2
560	1955	7038			<2
560	2445	8802			2
560	2935	10566			4
630	1240	4464			<2
630	2480	8928			<2
630	3095	11142			<2
630	3715	13374			<2
710	1575	5670			<2
710	3150	11340			<2
710	3935	14166			<2
710	4725	17010			<2
800	2000	7200			<2
800	4000	14400			<2
800	5000	18000			<2
800	6000	21600			<2

Circular silencers for air conditioning systems, rigid construction, available in 13 nominal sizes.

Insertion loss measured according to ISO 7235.

Casing with acoustic and thermal insulation.

Various types of connection, suitable for circular ducts to EN 1506 or EN 13180.

Casing air leakage to EN 15727, class B.

Special features

• Insertion loss measured according to ISO 7235
• Absorption material is non-combustible
• Insulation thickness 50 mm or 100 mm

Materials and surfaces

• Casing and perforated inner duct are galvanised sheet steel
• Lining is mineral wool

Mineral wool

• To EN 13501, fire rating class A1, non-combustible
• RAL quality mark RAL-GZ 388
• Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
• Faced with glass fibre as protection against erosion through airflow velocities up to 20 m/s
• Inert to fungal and bacterial growth

Technical data

• Nominal sizes: 100 to 800 mm
• Operating pressure: 1000 Pa max.
• Operating temperature: 100 °C max.

Sizing data

• D _______________________ [mm]
• H _______________________ [mm]
• Insulation thickness __________ [mm]
• V _______________________ [m³/h]
• D_e at 250 Hz ________________ [dB]
• Δp_st _______________________ [Pa]

CA

Variant

• Circular silencer for the reduction of noise
• Spigot

CA/.../VF1

Variant

• Circular silencer for the reduction of noise
• Spigot on one end to make connections to the ducting
• With flange on one end to make a detachable connection to the ducting

CA/.../VF2

Variant

• Circular silencer for the reduction of noise
• With flanges on both ends to make detachable connections to the ducting

Installation and commissioning

• Any installation orientation
• Installation in ducts outside of closed rooms requires sufficient protection against the effects of weather

Principal dimensions

ØD [mm]

Outer diameter of the spigot

ØD₃ [mm]

Outer diameter of circular silencers

L [mm]

Length of attenuator/silencer including spigot (in airflow direction)

L₁ [mm]

Length of acoustic cladding and acoustically effective length

B [mm]

Attenuator width and duct width (upright splitters)

H [mm]

Attenuator height and duct height (upright splitters)

T [mm]

Splitter thickness

S [mm]

Airway width

n [ ]

Number of flange screw holes

m [kg]

Weight

Nomenclature

f_m [Hz]

Octave band centre frequency

L_WA [dB(A)]

A-weighted sound power level of air-regenerated noise

D_e [dB]

Insertion loss

V [m³/h] and [l/s]

Volume flow rate

Δp_st [Pa]

Static differential pressure

All sound power levels are based on 1 pW.

All values were measured in a TROX lab and to EN ISO 7235. Intermediate values may be achieved by interpolation.

Lab measurements exceeding 50 dB are indicated as 50 dB, in line with common practice.