VRS • Constant air volume control dampers

Circular
Galvanized steel
50-1000 Pa

Datasheet

Adjustable self-regulating constant air volume control dampers in galvanised steel.

To be used to regulate airstreams at pressures between 50 and 1000 Pa and temperature ranges between –30°C and 100°C. Air-flow value can easily be changed by use of an allen key SW2

Application

For air volume regulation in ventilation and air-conditioning systems with following air volumes and duct sizes

Ø80: to be set between
40 & 125m³/h
Ø100: to be set between
70 & 220m³/h
Ø125: to be set between
100 & 280m³/h
Ø150: to be set between
170 & 450m³/h
Ø160: to be set between
180 & 500m³/h
Ø200: to be set between
250 & 900m³/h
Ø250: to be set between
500 & 1600m³/h
Ø315: to be set between
800 & 2800m³/h
Ø355: to be set between
900 & 3200m³/h
Ø400: to be set between
1000 & 4000m³/h

Accuracy: +/- 10% of the set air volume

Material

Galvanized steel housing
Aluminium regulation blade with piston and spring

Composition

Round housing made out of laser welded galvanised steel in standard duct sizes according to DIN EN 12237
Airtight connection up to class D with EPDM rubber according to DIN EN 12237
Balanced self-regulating aluminium blade with PTFE bearing and piston to prevent oscillations

Mounting

To be inserted at both sides into a round duct and to be equipped with a silencer if necessary
horizontal or vertical mounting

Accessories

Stainless steel models or insulation shells available upon request

Text for tender

The constant volume control dampers shall be of the circular type, made of galvanized steel and to be inserted at both ends in to the ductwork. They shall contain a self regulating valve, piston and stainless steel spring and shall have an adjustable air volume. The valves shall be used for a pressure range between 50 and 1000Pa.
Cairox Type VRS

Order example

VRS, 125

Explanation

VRS = Type of constant air valve

125 = Duct diameter

Dimensions

VRS	ØD [mm]	L1 [mm]	L2 [mm]	H [mm]
80	79	140	40	70
100	99	170	40	70
125	124	170	40	70
150	149	240	40	70
160	159	240	40	70
200	199	240	40	70
250	249	240	40	70
315	314	225	60	110
355	354	295	60	110
400	398	295	60	110

Technical data

Ø [mm]	Qv [m³/h]	100 Pa - Lw [dB] @ 0 / 6M
Ø [mm]	Qv [m³/h]	63Hz	125Hz	250Hz	500Hz	1kHz	2kHz	4kHz	8kHz	Lwa dB[A]
80	40	37/1	37/4	35/3	33/10	33/16	33/21	28/17	27/16	38/25
	82	49/13	47/14	44/12	41/18	39/22	39/27	33/22	32/21	45/30
	125	52/16	51/18	48/16	45/22	44/27	44/32	38/27	37/26	49/35
100	70	40/6	39/7	38/8	36/14	35/19	36/24	30/19	29/19	41/27
	135	50/16	48/16	45/15	42/20	41/25	40/28	34/23	33/23	46/32
	200	54/20	52/20	49/19	47/25	45/29	45/33	39/28	38/28	51/36
125	100	41/12	40/11	38/7	36/12	35/14	36/17	30/15	29/18	41/23
	190	51/22	49/20	46/15	42/18	41/20	40/21	34/19	32/21	46/27
	280	54/25	53/24	50/19	47/23	45/24	45/26	39/24	37/26	50/32
160	180	44/21	43/20	41/21	39/21	38/27	38/28	32/23	31/23	43/32
	340	53/30	51/28	48/28	44/26	43/32	42/32	36/27	34/26	48/37
	500	57/34	55/32	52/32	49/31	47/36	47/37	40/31	39/31	52/41
200	250	45/23	43/24	41/25	39/23	38/23	37/26	31/22	30/22	43/31
200	575	55/33	53/34	50/34	46/30	44/29	44/33	37/28	36/28	50/37
250	500	48/29	47/31	45/32	43/31	41/29	41/31	35/26	34/26	47/36
250	1000	57/38	55/39	52/39	49/37	47/35	46/36	39/30	38/30	52/41
315	600	48/30	46/32	44/32	41/28	39/28	39/28	32/24	31/23	44/34
315	1400	57/39	55/41	52/40	48/35	46/35	45/34	39/31	37/29	51/41
400	1000	50/33	48/37	45/35	42/32	41/31	40/31	33/26	31/25	46/37
400	2200	58/41	56/45	52/42	49/39	47/37	46/37	39/32	37/31	52/43
Ø [mm]	Qv [m³/h]	250 Pa - Lw [dB] @ 0 / 6M
Ø [mm]	Qv [m³/h]	63Hz	125Hz	250Hz	500Hz	1kHz	2kHz	4kHz	8kHz	Lwa dB[A]
80	40	39/3	42/9	43/11	44/21	44/27	46/34	41/30	41/30	50/37
	82	51/15	51/18	50/18	49/26	48/31	49/37	44/33	44/33	54/40
	125	61/25	60/27	57/25	54/31	53/36	53/41	47/36	46/35	58/44
100	70	43/9	45/13	46/16	46/24	47/31	49/37	44/33	43/33	53/40
	135	59/25	57/25	54/24	51/29	50/34	49/37	43/32	42/32	55/41
	200	63/29	61/29	58/28	55/33	54/38	54/42	48/37	47/37	59/46
125	100	45/16	47/18	47/16	48/24	48/27	49/30	44/29	43/32	54/36
	190	55/26	54/25	53/22	51/27	51/30	51/32	46/31	45/34	56/38
	280	63/34	61/32	58/27	55/31	54/33	53/34	47/32	46/35	59/40
160	180	48/25	50/27	50/30	50/32	50/39	51/41	46/37	45/37	56/45
	340	62/39	60/37	56/36	53/35	51/40	51/41	44/35	43/35	57/45
	500	66/43	64/41	61/41	58/40	56/45	55/45	49/40	48/40	61/50
200	250	51/29	52/33	52/36	51/35	51/36	51/40	45/36	44/36	56/44
200	575	64/42	62/43	58/42	55/39	53/38	53/42	46/37	45/37	59/46
250	500	54/32	56/37	55/42	55/43	54/42	55/45	49/40	48/40	60/49
250	1000	66/44	64/45	64/48	57/45	55/43	55/45	48/39	47/39	61/50
315	600	55/33	56/37	55/43	54/41	53/42	53/42	46/38	44/36	58/47
315	1400	66/44	64/45	60/48	57/44	55/44	54/43	47/39	46/38	60/49
400	1000	58/36	59/40	57/47	56/46	55/45	54/45	47/40	45/39	59/51
400	2200	67/45	65/46	61/51	57/47	55/45	54/45	48/41	46/40	61/51
Ø [mm]	Qv [m³/h]	500 Pa - Lw [dB] @ 0 / 6M
Ø [mm]	Qv [m³/h]	63Hz	125Hz	250Hz	500Hz	1kHz	2kHz	4kHz	8kHz	Lwa dB[A]
80	40	46/10	49/16	49/17	50/27	51/34	53/41	48/37	48/37	57/44
	82	58/22	58/25	56/24	55/32	55/38	56/44	51/40	51/40	61/48
	125	68/32	66/33	63/31	61/38	59/42	59/47	53/42	52/41	65/50
100	70	49/15	52/20	52/22	53/31	54/38	55/43	50/39	50/40	60/47
	135	60/26	60/28	58/28	57/35	57/41	58/46	53/42	52/42	63/50
	200	70/36	68/36	65/35	62/40	61/45	60/48	54/43	53/43	66/52
125	100	52/23	54/25	54/23	54/30	55/34	56/37	50/35	49/38	60/42
	190	61/32	61/32	59/28	58/34	57/36	58/39	52/37	52/41	63/45
	280	64/35	64/35	62/31	61/37	61/40	62/43	57/42	56/45	67/49
160	180	55/32	57/34	57/37	57/39	58/47	53/43	51/42	53/55	62/55
	340	64/41	64/41	62/42	60/42	60/49	60/50	55/46	54/46	65/55
	500	72/49	70/47	67/47	64/46	62/51	62/52	56/47	54/46	68/56
200	250	57/35	59/40	58/42	58/42	57/42	58/47	52/43	50/42	63/51
200	575	66/44	66/47	64/48	62/46	62/47	62/51	56/47	56/48	67/55
250	500	61/39	62/43	62/49	61/49	61/49	62/52	56/47	54/46	66/56
250	1000	69/47	68/49	67/54	65/53	64/52	64/54	59/50	58/50	69/59
315	600	62/40	63/44	62/50	61/48	60/49	59/48	53/45	51/43	65/54
315	1400	70/48	69/50	67/55	65/52	64/53	64/53	58/50	57/49	69/59
400	1000	65/43	65/46	64/54	62/52	61/51	61/52	54/47	51/45	66/57
400	2200	72/50	71/52	68/58	66/56	65/55	65/56	59/52	57/51	70/61

Symbols and specifications

Q [m³/h] = Air volume in m³/h
Ø = Duct diameter in mm
100Pa, 250Pa of 500Pa = Static pressure in Pa
Lw (0m (int.)) = Generated sound power in the duct divided into dB per octave band at 0 m
Lw ext. duct L = 6m = The radiated sound of a duct with a length of 6 m expressed as Lw in dB

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	Introduction

A	Products for air diffusion

B	Valves & volume control dampers

	B01	Multi-leaf dampers

	B02	Constant volume control dampers (CAV)

	B03	Iris dampers

	B04	Circular and rectangular control valves

	B05	Variable Volume valves (VAV)

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