Sound Attenuator

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QD-ZKFX Rectangular Sound Attenuator

Sound attenuators are designed to reduce noise generated by fans and other equipment in industrial settings. The installation of a sound attenuator on the inlet or outlet of a ventilation system has been proven to reduce noise levels by as much as 10 to 40 dB(A) - and 50 to 93% drop in noise levels. Our sound attenuators are made of either carbon steel or stainless steel depending on customer requirements, and feature a small size, silent performance, light weight, and easy installation. They are widely used in power generation, chemical, metallurgical, and textile industries.

Quanda provides customized sound attenuators to meet unique customer requirements.

This regular sound attenuator is designed to reduce noise in medium and low-pressure fans in air conditioning systems and heat ventilation systems with a silencing effect per unit length as follows: 10~15dB for low frequency, 10~25db for medium frequency, and 25~30db for high frequency. Its average drag coefficient is 0.4, making it ideal for the place where wind speed is 6-12m/s (mm).

Specifications

No	Size(mm)		Length(mm)	Effective Cross-sectional Area (m2)	Expansion Ratio (M)	Effective Cross-Sectional Frequency (Hz)	Applicable Air Volume (mm³/h)
No	A×B	a×b	Length(mm)	Effective Cross-sectional Area (m2)	Expansion Ratio (M)	Effective Cross-Sectional Frequency (Hz)	Velocity 6m/s	Velocity 8m/s	Velocity 10m/s	Velocity 12m/s
1	800×500	520×230	1600	0.093	4.26	596	2000	2660	3330	4000
2	800×600	510×370	1600	0.139	3.91	507	3000	4000	5000	6000
3	1000×600	700×370	1600	0.186	3.17	480	4000	5330	6670	8000
4	1000×800	770×400	1600	0.231	3.46	420	5000	6660	8320	10000
5	1200×800	700×550	900	0.278	3.43	380	6000	8000	10000	12000
6	1200×1000	780×630	900	0.372	3.20	339	8000	10660	13340	16000
7	1500×1000	950×630	900	0.463	3.29	430	10000	13320	16640	20000
8	1500×1400	1000×970	900	0.695	3.70	513	15000	2000	25000	30000
9	1800×1400	1300×970	900	0.928	2.73	470	20000	26700	33400	40000
10	2000×1800	1500×1310	900	1.390	2.59	393	30000	40000	50000	60000

QD-ZKGX Rectangular Duct Silencer

Rectangular duct silencers use porous sound absorption materials in airflow ducts to attenuate sound waves for a noise reduction. The friction between acoustic energy and porous sound absorbing materials converts the acoustic energy into heat.

Serial	The noise reduction at the octave center frequency (dB)							Size(mm)				Weight(KG)
Serial	100	200	400	800	1600	3150	6300	a	b	A	B	Weight(KG)
Extra-fine glass wool sound attenuator QD-ZG
1	7.7	15	20.8	23.4	26.2	27.2	18.0	300	300	200	200	32.9
2	6.4	12.5	17.3	19.4	21.8	14.6	7.2	300	400	200	300	38.9
3	5.8	11.3	15.6	17.5	19.7	13.2	6.6	300	500	200	400	44.8
4	6.2	12	16.6	18.8	21	14.0	7.0	350	350	250	250	38.1
5	5.1	10	13.9	15.6	17.5	12.0	6.0	350	475	250	375	46.5
6	4.6	9	12.5	14	15.8	10.5	5.3	350	600	250	500	53.9
7	5.1	10	13.9	15.6	17.5	11.7	5.8	400	400	300	300	44.8
8	4.2	8.3	11.6	12.9	14.6	9.7	4.9	400	550	300	450	53.9
9	3.8	7.5	10.4	11.7	13.2	8.8	4.4	400	700	300	600	62.8

QD-GPX Duct Silencer

The duct silencer is equipped with sound-absorption sheets and installed inside large-scale air ducts. These sound-absorbing sheets form several flat muffler channels, which is why the duct silencer is also called a tubular type silencer. Quanda provides sound-absorbing sheets in a variety of thicknesses, including 50, 100, and 200mm. These sound absorbing sheets are suitable for ductwork with air volume ranges of 750m³/H to 80000m³/H.

QD-SWX Sound Attenuator

This sound attenuator features a double-wall structure and outstanding silencing effect. The broadband sound absorption is more than 1/3 octave bands, making this sound attenuator ideal for ductwork that needs to be moisture and high temperature resistant. For customers with added requirements for degree of cleanliness, we will also customize the sound attenuator, ensuring it is manufactured in accordance with customer provided design drawings.

YXSQ Sound Attenuator

This sound attenuator is equipped with a cross sound-absorption sheet within the cross-sectional area to increase the noise reduction performance and rigidity.

Model	Size d×L(mm)	Flange Length D(mm)	Airflow m3/h	Insertion loss Pa	Noise Reduction dB(A)	Model	Size d×L(mm)	Flange Length D(mm)	Airflow m3/h	Insertion loss Pa	Noise Reduction dB(A)
1	320×1100	200	670~890	5.9	15~20	5	440×1100	320	1720~2290	5.9	15~20
2	340×1100	220	810~1080	5.9	15~20	6	480×1100	360	2180~2910	5.9	15~20
3	370×1100	250	1050~1400	5.9	15~20	7	520×1100	400	2690~3590	5.9	15~20
4	400×1100	280	1320~1750	5.9	15~20	8	570×1100	450	3410~4550	5.9	15~20

QD-ZB Sound Attenuator

Length (mm)	Air Velocity (m/s)	Static Pressure Loss (mmH2O)	Noise Reduction (dB) in the Frequency (Hz)
Length (mm)	Air Velocity (m/s)	Static Pressure Loss (mmH2O)	125	250	500	1000	2000	4000
900 (one section)	8	3.8	7.0	14.0	18.0	19.5	24.0	25.5
	6	1.0	7.0	14.3	20.0	20.7	25.5	25.3
	4	0.4	7.5	14.5	22.0	21.7	27.0	28.0
1800 (two sections)	8	5.2	11.0	22.3	31.0	32.2	39.7	40.9
	6	2.8	12.6	25.5	35.4	36.8	45.3	41
	4	1.4	13.4	27.0	37.6	39.1	48.2	49.7
2700 (three sections)	8	7.0	13.2	26.8	37.2	38.6	47.6	49.1
	6	3.2	15.9	32.2	44.7	46.5	57.2	59.0
	4	1.9	17.2	34.9	48.4	50.4	62.1	54.0

ZXSW Sound Attenuator

This sound attenuator features perforated sound absorbing acoustic panels filled with an extra-fine glass wool inside the inner wall for a noise reduction performance.

Model ZXW-I	Size	1	2	3	4	5	6	7
	A×B(mm)	320×200	320×250	320×320	400×200	400×250	400×320	400×400
	Size	8	9	10	11	-	-	-
	A×B(mm)	500×200	500×250	500×320	500×400	-	-	-
Model ZXW-II	Size	12	13	14	15	16	17	18
	A×B(mm)	630×200	630×400	630×500	630×630	800×320	800×400	800×500
	Size	19	20	21	22	23	24	25
	A×B(mm)	800×630	800×800	1000×400	1000×500	1000×630	1000×800	1000×1000
Model ZXW-III	Size	26	27	28	29	30	31	32
	A×B(mm)	1250×400	1250×500	1250×630	1250×800	1250×1000	1600×500	1600×630
	Size	33	34	35	36	37	38	39
	A×B(mm)	1600×800	1600×1000	1600×1250	2000×630	2000×800	2000×1000	2000×1250

XJYX Sound Attenuator

Sound absorption material inside this sound attenuator is glass wool wrapped in a glass cloth and a galvanized orifice plate lining. This high-performance sound attenuator is often used in air inlets and outlets of ventilation and air conditioning systems to effectively reduce dynamic pressure, increase static pressure, and stabilize the airflow.

XBYC Sound Attenuator

This sound attenuator is designed for noise reduction in service rooms without affecting ventilation. It will also reduce outdoor interference for server rooms. It is made of a high-quality galvanized steel, aluminum alloy, or stainless steel according to customer requirements, and uses a small, elliptical shaped wing sound absorption sheet for noise reduction. The sound attenuator is widely used in ventilation systems for service rooms, hotels, hospitals, and other areas.

Specifications

Thickness of Sound Attenuator (mm)	Size (W×H)	Noise Reduction (dB) in the Frequency (Hz)
Thickness of Sound Attenuator (mm)	Size (W×H)	125	250	500	1000	2000	4000
300	300×600	10.0	11.0	12.0	15.0	19.0	20.0
	600×800	10.1	11.2	12.1	15.2	19.2	20.1
	900×1000	10.2	11.3	12.2	15.3	19.4	20.3
	900×1200	10.3	11.5	12.3	15.5	19.5	20.4
	1200×1200	10.5	11.7	12.5	15.6	19.7	20.5
	1200×2000	10.8	11.9	12.8	15.8	19.8	20.7

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