CF | TROX Italia S.p.A.

Flexible circular silencer Type CF

CF

For the reduction of noise in circular ducts, flexible aluminium construction

Circular silencers, in flexible aluminium construction, for the reduction of noise in the circular ducts of air conditioning systems

Absorption material is non-combustible mineral wool with RAL quality mark, biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
Casing and perforated inner duct made of aluminium
Variant with spigot has a groove for a lip seal, suitable for circular connecting ducts to EN 1506 or EN 13180
Insertion loss measured according to ISO 7235
Casing air leakage to EN 15727, class D

Optional equipment and accessories

Socket-type spigots on both ends
Raised edges at both ends
With lip seals on both ends

Application

Application

Flexible circular silencers Type CF for the reduction of noise in the circular ducts of air conditioning systems
For the reduction of air-regenerated noise of air terminal units LVC and TVR, and of mechanical self-powered controllers RN and VFC
For the reduction of fan noise
Can be used as cross talk silencer to reduce the transfer of noise through ducts between neighbouring rooms

Special characteristics

Insertion loss measured according to ISO 7235
Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
Absorption material is non-combustible
Insulation thickness 25 mm or 50 mm
Smallest bend radius 3 × outer diameter D₃

Nominal sizes

80, 100, 125, 160, 200, 250, 315, 400 mm

Description

Variants

025: Circular silencer with 25 mm insulation
050: Circular silencer with 50 mm insulation
AS2: Circular silencer with socket-type spigots on both ends
BK2: Circular silencer with raised edges at both ends

Parts and characteristics

Casing
Perforated inner tube
Absorption material

Accessories

VD2: With lip seals on both ends
AS2: Socket-type spigots on both ends
BK2: Raised edges at both ends

Construction features

Circular casing
Flexible construction
Spigot suitable for circular ducts to EN 1506 or EN 13180
Spigot with groove for lip seal
Maximum operating pressure 1000 Pa
Max. operating temperature 100 °C

Materials and surfaces

Casing and perforated inner duct made of aluminium
Lining is mineral wool
End pieces made ABS plastic, flammability to UL 94, V-0 (nominal sizes 80 – 125)
End pieces made of aluminium (nominal sizes 160 – 400)

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
Inert to fungal and bacterial growth

Standards and guidelines

Insertion loss measured according to ISO 7235
Casing air leakage to EN 15727, class D

Maintenance

Maintenance-free as construction and materials are not subject to wear

Technical information

Technical data, Quick sizing, Specification text, Order code

Nominal sizes	80 – 400 mm
Operating pressure	1000 Pa max.
Operating temperature	100 °C max.

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.

CF025 (insulation thickness 25 mm), insertion loss

Nominal size	Nominal length	Centre frequency f_m [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
Nominal size	Nominal length	D_e
Nominal size	mm	Hz
80	500	1	2	4	9	20	16	15	10
80	1000	3	5	10	21	44	46	37	23
80	1500	3	5	13	28	47	48	44	31
80	2000	3	6	15	35	50	50	50	39
100	500	1	1	4	8	17	14	12	9
100	1000	2	3	8	17	44	34	28	21
100	1500	2	4	12	24	47	41	34	26
100	2000	2	5	15	30	50	49	41	31
125	500	1	1	3	8	15	11	9	7
125	1000	2	3	7	17	43	30	24	17
125	1500	2	3	10	22	45	34	28	20
125	2000	2	4	12	28	48	37	32	23
160	500	1	1	2	5	14	10	8	6
160	1000	1	1	4	12	40	27	20	16
160	1500	2	2	6	16	42	30	25	19
160	2000	2	3	8	20	47	34	28	21
200	500	1	1	2	5	14	9	6	5
200	1000	1	1	3	11	35	22	16	13
200	1500	2	2	5	15	41	27	19	15
200	2000	1	3	7	19	47	32	20	16
250	500	0	1	2	5	13	8	5	4
250	1000	1	1	3	11	30	19	12	10
250	1500	1	2	5	15	38	25	14	11
250	2000	1	3	6	17	43	30	15	13
315	500	0	1	1	4	9	7	4	3
315	1000	0	1	3	9	21	10	12	8
315	1500	1	2	4	12	27	19	13	10
315	2000	1	2	6	14	32	27	13	11
400	500	0	0	1	3	6	5	3	3
400	1000	0	1	3	8	16	8	8	7
400	1500	1	1	4	10	23	17	11	8
400	2000	1	2	4	10	23	22	11	9

CF050 (insulation thickness 50 mm), insertion loss

Nominal size	Nominal length	Centre frequency f_m [Hz]
Nominal size	Nominal length	63	125	250	500	1000	2000	4000	8000
Nominal size	Nominal length	D_e
Nominal size	mm	Hz
80	500	4	5	11	20	30	27	16	12
80	1000	8	14	23	47	50	50	44	27
80	1500	11	14	33	48	50	50	47	37
80	2000	15	15	42	50	50	50	50	47
100	500	3	4	9	17	24	21	12	10
100	1000	7	10	21	38	50	50	29	22
100	1500	10	11	27	44	50	50	37	30
100	2000	12	12	34	50	50	50	46	37
125	500	2	3	7	14	20	16	11	9
125	1000	5	7	16	32	50	42	25	22
125	1500	7	9	21	41	50	46	33	27
125	2000	9	11	27	50	50	50	40	31
160	500	2	2	6	12	17	14	8	6
160	1000	4	5	12	26	47	34	20	16
160	1500	5	7	17	37	48	42	24	19
160	2000	6	9	22	48	50	50	29	21
200	500	1	2	5	12	16	11	6	5
200	1000	3	5	11	25	45	26	16	13
200	1500	4	6	14	37	48	34	18	15
200	2000	5	8	18	47	50	42	22	18
250	500	1	2	4	12	15	8	5	4
250	1000	2	4	9	25	40	19	12	10
250	1500	3	5	11	35	45	25	14	11
250	2000	4	6	15	45	50	30	16	13
315	500	1	1	3	9	12	6	4	3
315	1000	1	4	8	22	28	13	12	8
315	1500	2	4	10	26	35	19	12	10
315	2000	3	4	12	33	41	27	14	11
400	500	1	1	3	7	9	6	4	3
400	1000	1	4	8	18	23	11	10	7
400	1500	2	4	9	20	26	17	11	8
400	2000	3	3	9	22	29	22	11	9

CF, differential pressure

Nominal size	V		Nennlänge [mm]
Nominal size	V		500	1000	1500	2000
Nominal size	V		∆p_st
Nominal size	l/s	m³/h	Pa
80	20	72	2	4	6	6
80	40	144	6	12	16	25
80	50	180	8	16	25	35
80	55	198	12	25	35	45
100	30	108	2	2	4	5
100	60	216	4	8	12	16
100	75	270	6	12	18	25
100	90	324	8	18	25	35
125	50	180	2	2	4	4
125	95	342	4	6	10	12
125	120	432	6	10	14	18
125	145	522	6	14	20	25
160	80	288	2	2	2	4
160	155	558	2	6	8	10
160	195	702	4	8	10	14
160	235	846	6	10	14	18
200	125	450	2	2	2	2
200	245	882	2	4	6	8
200	310	1116	4	6	8	10
200	370	1332	4	8	10	14
250	195	702	<2	<2	<2	2
250	385	1386	<2	4	4	6
250	485	1746	2	4	6	8
250	580	2088	4	6	8	10
315	310	1116	<2	<2	<2	<2
315	615	2214	<2	2	4	4
315	770	2772	<2	4	4	6
315	925	3330	2	4	6	8
400	500	1800	<2	<2	<2	<2
400	995	3582	<2	<2	2	4
400	1245	4482	<2	2	4	4
400	1495	5382	<2	4	4	6

Circular silencers for air conditioning systems, flexible construction, available in 8 nominal sizes.

Insertion loss measured according to ISO 7235.

Casing with acoustic and thermal insulation.

Spigot with groove for lip seal, suitable for circular connecting ducts to EN 1506 or EN 13180.

Casing air leakage to EN 15727, class D.

Special characteristics

Insertion loss measured according to ISO 7235
Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces
Absorption material is non-combustible
Insulation thickness 25 mm or 50 mm
Smallest bend radius 3 × outer diameter D₃

Materials and surfaces

Casing and perforated inner duct made of aluminium
Lining is mineral wool
End pieces made ABS plastic, flammability to UL 94, V-0 (nominal sizes 80 – 125)
End pieces made of aluminium (nominal sizes 160 – 400)

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
Inert to fungal and bacterial growth

Technical data

Nominal sizes: 80 to 400 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]

Type
CF Flexible circular silencer

Insulation thickness [mm]
025 25
050 50

Nominal size [mm]
80
100
125
160
200
250
315
400

Nominal length [mm]
500
1000
1500
2000

Type of connection
       No entry: spigot
VD2       Spigot with lip seal on both ends
AS2       Socket-type spigots on both ends
BK2       Raised edges at both ends

Order example: CF-050/160×1000/VD2

Insulation thickness	50 mm
Nominal size	160 mm
Length	1000 mm
Type of connection	Spigot with lip seal on both ends

Variants, Dimensions and weight

Variant

Circular silencer for the reduction of noise
Spigot

CF/.../AS2

Variant

Circular silencer for the reduction of noise
Socket-type spigots to make connections to the ducting

CF/.../BK2

Variant

Circular silencer for the reduction of noise
With raised edges to make detachable connections to the ducting

CF, dimensions

Nominal size	CF-025 ØD₃ mm	CF-050 ØD₃ mm	ØD mm	ØD₂ mm
80	135	192	79	93
100	160	212	99	113
125	191	236	124	138
160	221	271	159	173
200	261	311	199	213
250	311	366	249	263
315	376	426	314	328
400	461	511	399	413

CF, lengths

Nominal length mm L_N	CF L mm	CF/.../AS2 L mm	CF/.../BK2 L mm	L₁ mm
500	650	650	638	500
1000	1150	1150	1138	1000
1500	1650	1650	1638	1500
2000	2150	2150	2138	2000

CF, weights

Nominal size	CF-025 500 m kg	CF-025 1000 m kg	CF-025 1500 m kg	CF-025 2000 m kg	CF-050 500 m kg	CF-050 1000 m kg	CF-050 1500 m kg	CF-050 2000 m kg
80	0.6	1.0	1.5	1.9	0.9	1.5	2.2	2.8
100	0.8	1.3	1.7	2.2	1.1	1.8	2.5	3.2
125	0.9	1.5	2.1	2.7	1.2	2.0	2.9	3.7
160	1.1	1.8	2.5	3.2	1.4	2.4	3.3	4.3
200	1.3	2.2	3.0	3.9	1.7	2.9	4.0	5.1
250	1.6	2.7	3.7	4.7	2.1	3.5	4.8	6.2
315	1.9	3.2	4.5	5.7	2.4	4.0	5.6	7.2
400	2.5	4.1	5.6	7.2	3.1	5.1	7.1	9.1

Installation details, Basic information and nomenclature

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.

Downloads

informazioni di prodotto

Product data sheet Type CF

Product data sheet 1 MB pdf

certificati

Certificate concerning statistical leakage tests

LC_v2_2024_10_DE_en Certificate 650 KB pdf
Declaration of conformity or declaration of incorporation Type CA

Declaration of conformity or declaration of incorporation 130 KB pdf

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CF

For the reduction of noise in circular ducts, flexible aluminium construction

Application

Description

Technical information

Technical data, Quick sizing, Specification text, Order code

Variants, Dimensions and weight

Installation details, Basic information and nomenclature

Downloads

informazioni di prodotto

Product data sheet Type CF

certificati

Certificate concerning statistical leakage tests

Declaration of conformity or declaration of incorporation Type CA

TROX Services

TECNICAMENTE NECESSARIO

STATISTICHE E ANALISI DEL SITO WEB

CONVENIENZA E PERSONALIZZAZIONE

PER LA MIGLIORE ESPERIENZA TROX