CF | S.A. TROX Belgium/TROX Belgium N.V.

Flexible circular silencer Type CF

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

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

The sound absorbing 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

General Information

Application

Flexible circular silencer for the reduction of noise in the circular ducts of ventilation and air conditioning systems

For the reduction of air-regenerated noise of air terminal units LVC, TVR, TVE and of mechanical self-powered control units 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

The sound absorbing material is non-combustible

Insulation thickness 25 mm or 50 mm

Smallest bend radius 3 × outer diameter ØD₃

Nominal sizes

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

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

Max. operating pressure 1000 Pa

Max. operating temperature 100 °C

Material and surfaces

Casing and perforated inner duct made of aluminium

Lining is mineral wool

End pieces made of aluminium

Mineral wool

To EN 13501, fire rating Class A1, non-combustible

RAL quality mark RAL-GZ 388

Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008

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

Low-maintenance 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 plain, unprofiled ducts. 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 D_e [dB]

NS	FL_N	Centre frequency f_m[Hz]
NS	FL_N	63	125	250	500	1000	2000	4000	8000
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 D_e [dB]

NS	FL_N	Centre frequency f_m [Hz]
NS	FL_N	63	125	250	500	1000	2000	4000	8000
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 Δp_t [Pa]

NS	q_ᵥ [l/s]	q_ᵥ (m³/h)	500	1000	1500	2000
NS	q_ᵥ [l/s]	q_ᵥ (m³/h)	Δp_t [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

Specification text

Circular silencers for ventilation and 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 lip seal for circular ducts according to EN 1506 or EN 13180. Casing leakage to EN 15727, class D.

Special features

Insertion loss measured according to ISO 7235

Very flexible and consequently suitable for installation in complicated duct systems and restricted spaces

The sound absorbing material is non-combustible

Insulation thickness 25 mm or 50 mm

Smallest bend radius 3 × outer diameter ØD₃

Material and surfaces

Casing and perforated inner duct made of aluminium

Lining is mineral wool

End pieces made of aluminium

Mineral wool

To EN 13501, fire rating Class A1, non-combustible

RAL quality mark RAL-GZ 388

Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008

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

ØD [mm]

H [mm]

Insulation thickness [mm]

q_v (m³/h)

D_e At 250 Hz [dB]

Δp_t[Pa]

CF	–	025	/	160	×	1000	/	VD2
\|		\|		\|		\|		\|
1		2		3		4		5

1 TypeCF flexible circular silencer 2 Insulation thickness [mm]025 25050 50 3 Nominal size [mm]80, 100, 125, 160, 200, 250, 315, 400 4 Nominal length [mm]500, 1000, 1500, 2000 5 Type of connectionNo entry: spigotVD2 Spigot with lip seal on both endsAS2 Socket-type spigots on both endsBK2 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, Product details

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

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

Downloads

product information

Product data sheet Type CF

CF_PD_2024_03_28_DE_en Product data sheet 290 KB pdf

certificates

Certificate concerning statistical leakage tests

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

Declaration of conformity or declaration of incorporation 130 KB pdf
Leakage classification

Leckageklassifizierung_FK2-EU_v1_HC_2021_05_19_DE_en certificate 670 KB pdf
Non-CE Manufacturer's statement CF

CF_NotCE_2022_02_08_14_48_07_DE_en Certificate 1,4 MB pdf

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CF

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

General Information

Technical information

Technical data, Quick sizing, Specification text, Order code

Variants, Product details

Downloads

product information

Product data sheet Type CF

certificates

Certificate concerning statistical leakage tests

Declaration of conformity or declaration of incorporation Type CF

Leakage classification

Non-CE Manufacturer's statement CF

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