CF | TROX GROUP US

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Help Desk more previous Flexible circular silencer Type CF

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

• 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 De [dB]

NS	FLN	Centre frequency fm [Hz]
		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 De [dB]

NS	FLN	Centre frequency fm [Hz]
		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 Δpt [Pa]

NS	qᵥ [l/s]	qᵥ (m³/h)	500	1000	1500	2000
			Δpt [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
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