Type VSD 35-3-AZ

Type VSD35-3-AZ

Ventilation and extract ventilation combined in one casing

Slot diffusers with 35 mm nominal width, used as supply and extract air combination

Nominal length from 600 to 1200 mm, 3 slots
Volume flow rate range 8 – 40 l/s or 30 – 144 m³/h
Diffuser face made of extruded aluminium sections
For variable and constant volume flows
High induction results in a rapid reduction of the temperature difference and airflow velocity
Individually adjustable air control elements to meet individual local requirements

Optional equipment and accessories

Exposed diffuser face available in RAL CLASSIC colours
Damper blade for volume flow rate balancing, can be adjusted through the diffuser face
Acoustic lining that ensures very good transmission loss
Spring clip fixing
End angles, fixing brackets

VSD35-3-AZ 00181308_0

Black air control elements

Wall installation

Application

Type VSD35-3-AZ slot diffusers are used as supply and extract air combinations in comfort zones
Angled one-way air discharge for turbulent flow (mixed flow ventilation)
High induction results in a rapid reduction of the temperature difference and airflow velocity
For variable and constant volume flows
For supply air to room air temperature differences from –10 to +10 K
For room heights up to 4 m (lower edge of suspended ceiling)
For horizontal installation into walls and bulkheads

Special characteristics

Individually adjustable air control elements to meet individual local requirements
High induction results in a rapid reduction of the temperature difference and airflow velocity
Diffuser face has been optimised for maximum volume flow rate at low sound power levels
Suitable for continuous linear arrangement

Nominal sizes

L_N: 600, 750, 900, 1050, 1200 mm

Variants

VSD35-3-AZ-...: supply and extract air combination without acoustic lining (cross talk reduction)
VSD35-3-AZ-...-ZT: Supply and extract air combination with acoustic lining (cross talk reduction)
VSD35-3-AZ-...: Black air control elements
VSD35-3-AZ-.../WW: White air control elements

Plenum box and diffuser face fixing

AK: Plenum box with rigid fixing
AS: Plenum box with spring clip fixing

Parts and characteristics

Diffuser face with individually adjustable air control elements
Plenum box for horizontal duct connection
Spring clip fixing (facilitates installing the diffuser face) or screw fixing

Attachments

Damper blade for volume flow rate balancing
End angle

Accessories

Lip seal
Fixing brackets

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180
Spigot with groove for lip seal (if accessory lip seal has been ordered)

Materials and surfaces

Diffuser face made from extruded aluminium sections
Air control elements made of plastic, UL 94, V-0, flame retardant
Plenum box and fixing brackets made of galvanised sheet steel
End angle made of aluminium
Lip seal made of rubber
Acoustic lining of the cross-talk attenuator is mineral wool
Diffuser face with anodised finish, E6-C-0, natural colour
P1: Powder-coated, RAL CLASSIC colour
Air control elements similar to RAL 9005, black
WW: Air control elements similar to RAL 9010, white

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
Faced with glass fibre fabric as a protection against abrasion through airflow velocities of up to 20 m/s
Inert to fungal and bacterial growth

Standards and guidelines

Sound power level of the air-regenerated noise measured according to EN ISO 5135

Maintenance

Maintenance-free as construction and materials are not subject to wear
Inspection and cleaning to VDI 6022

Technical information

Function, Technical data, Quick sizing, Specification text, Order code

Schematic illustration of VSD35-3-AZ with acoustic lining

① Diffuser face
② Adjustable air control element
③ Extract air spigot
④ Plenum box
⑤ Supply air spigot
⑥ End angle
⑦ Cords for supply air (white cord for opening, green cord for closing)
⑧ Cords for extract air (white cord for opening, green cord for closing)
Optional
⑨ Acoustic lining (reduces room-to-room cross talk)
⑩ Lip seal

Functional description

Slot diffusers direct the air from air conditioning systems at an angle into the room. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.

Type VSD35-3-AZ slot diffusers have adjustable air control elements. The supply air to room air temperature difference may range from –10 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning.

Type VSD35-3-AZ diffusers are space saving supply and extract air combinations.

Nominal length	600, 750, 900, 1050, 1200 mm
Number of slots	3
Minimum volume flow rate, with Δt_Z = –6 K	8 – 15 l/s or 30 – 54 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A)	25 – 40 l/s or 90 – 144 m³/h
Supply air to room air temperature difference	–10 to +10 K

Transmission loss – supply air

Nominal length	Centre frequency fm [Hz]
Nominal length	125	250	500	1000	2000
Nominal length	D_t
Nominal length	dB
600, 750, 900, 1050, 1200	14	7	7	4	4

Transmission loss – extract air

Nominal length	Centre frequency fm [Hz]
Nominal length	125	250	500	1000	2000
Nominal length	D_t
Nominal length	dB
600, 750, 900, 1050, 1200	14	7	7	4	4

Transmission loss – supply air

Nominal length	Centre frequency fm [Hz]
Nominal length	125	250	500	1000	2000
Nominal length	D_t
Nominal length	dB
600, 750	16	13	14	16	25
900, 1050, 1200	18	12	14	21	26

Transmission loss – extract air

Nominal length	Centre frequency fm [Hz]
Nominal length	125	250	500	1000	2000
Nominal length	D_t
Nominal length	dB
600, 750	15	11	11	15	22
900, 1050, 1200	17	11	13	19	25

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.

VSD35-3-AZ, sound power level and total differential pressure

Nominal length	V		Damper blade position
Nominal length	V		0°			45°			90°
Nominal length	V		Δp_{t supply air}	Δp_{t extract air}	L_WA	Δp_{t supply air}	Δp_{t extract air}	L_WA	Δp_{t supply air}	Δp_{t extract air}	L_WA
Nominal length	l/s	m³/h	Pa		dB(A)	Pa		dB(A)	Pa		dB(A)
600	8	30	6	3	15	9	5	17	26	13	24
600	15	54	19	9	31	31	16	34	85	43	40
600	25	90	54	26	45	86	45	47	237	120	54
600	30	108	77	37	50	124	65	52	341	173	59
750	10	37	7	4	21	12	8	23	28	19	31
750	20	72	28	15	38	44	31	40	107	74	47
750	25	90	44	24	44	68	48	46	167	116	53
750	30	108	64	35	48	98	70	51	241	167	57
900	12	44	9	6	23	14	10	26	37	28	29
900	20	72	24	15	36	37	27	39	97	74	44
900	30	108	55	33	46	82	60	50	217	167	55
900	35	126	74	45	51	112	82	54	296	228	60
1050	15	54	12	8	28	17	15	30	58	39	38
1050	25	90	34	22	40	48	41	44	161	110	51
1050	35	126	66	43	49	95	80	53	316	215	60
1050	40	144	86	56	52	124	104	56	413	281	63
1200	15	54	11	8	26	20	13	29	55	41	38
1200	30	108	44	30	44	79	52	47	218	165	56
1200	35	126	60	41	48	107	71	52	297	225	60
1200	40	144	79	54	51	140	92	55	388	293	63

VSD35-3-AZ-ZT, sound power level and total differential pressure

Nominal length	V		Damper blade position
Nominal length	V		0°			45°			90°
Nominal length	V		Δp_{t supply air}	Δp_{t extract air}	L_WA	Δp_{t supply air}	Δp_{t extract air}	L_WA	Δp_{t supply air}	Δp_{t extract air}	L_WA
Nominal length	l/s	m³/h	Pa		dB(A)	Pa		dB(A)	Pa		dB(A)
600	8	30	13	9	18	13	10	18	22	17	20
600	15	54	42	30	35	43	35	36	73	58	36
600	20	72	74	53	44	76	62	44	130	104	44
600	25	90	116	83	50	119	96	51	203	162	50
750	10	36	19	15	24	12	16	25	32	31	26
750	15	54	43	33	36	44	36	37	73	69	37
750	20	72	76	58	44	68	65	46	129	122	44
750	25	90	118	91	51	98	101	52	202	191	50
900	12	44	19	14	24	14	17	24	45	36	26
900	20	72	51	37	38	37	44	37	118	95	39
900	25	90	79	58	44	82	69	43	184	149	45
900	30	108	114	83	49	112	100	48	265	215	50
1050	15	54	27	21	30	17	31	31	65	56	32
1050	25	90	76	59	44	48	86	45	182	155	45
1050	30	108	110	84	49	95	124	50	261	223	50
1050	35	126	149	115	53	124	169	54	356	304	54
1200	15	54	28	21	30	20	26	29	65	54	31
1200	20	72	49	38	38	79	45	37	116	95	39
1200	30	108	111	85	49	107	102	48	261	215	49
1200	35	126	151	115	53	140	139	52	355	292	53

Slot diffusers with individually manually adjustable air control elements and an aesthetically shaped face section with three slots, for angled one-way air discharge. Supply and extract air combination. For wall and bulkhead installation.

Ready-to-install component which consists of the diffuser face with individually adjustable black or white air control elements, and of a plenum box with a side entry spigot and a side extract air spigot.

Spring clip fixing or rigid fixing to the plenum box

Spigot suitable for circular ducts to EN 1506 or EN 13180.

Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Transmission loss measured according to EN ISO 7235.

Special characteristics

Individually adjustable air control elements to meet individual local requirements
High induction results in a rapid reduction of the temperature difference and airflow velocity
Diffuser face has been optimised for maximum volume flow rate at low sound power levels
Suitable for continuous linear arrangement

Materials and surfaces

Diffuser face made from extruded aluminium sections
Air control elements made of plastic, UL 94, V-0, flame retardant
Plenum box and fixing brackets made of galvanised sheet steel
End angle made of aluminium
Lip seal made of rubber
Acoustic lining of the cross-talk attenuator is mineral wool
Diffuser face with anodised finish, E6-C-0, natural colour
P1: Powder-coated, RAL CLASSIC colour
Air control elements similar to RAL 9005, black
WW: Air control elements similar to RAL 9010, white

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
Faced with glass fibre fabric as a protection against abrasion through airflow velocities of up to 20 m/s
Inert to fungal and bacterial growth

Technical data

Nominal length: 600, 750, 900, 1050, 1200 mm
Number of slots: 3
Minimum volume flow rate: 8 – 15 l/s or 30 – 54 m³/h
Maximum volume flow rate, with L_WA ≅ 50 dB(A): 25 – 40 l/s or 90 – 144 m³/h
Supply air to room air temperature difference: –10 to +10 K

Sizing data

V _______________________ [m³/h]
Δp_t _______________________ [Pa]

Air-regenerated noise

L_WA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Type
VSD35-3-AZ Slot diffuser as supply and extract air combination

Connection
       Plenum box
AK       With rigid fixing
AS       With spring clip fixing

Acoustic lining for cross talk reduction (accessory)
No entry: none
ZT With

Damper blade for volume flow rate balancing
No entry: none
M With

Accessories
No entry: none
L With lip seal

Nominal size [mm]
600
750
900
1050
1200

End pieces
No entry: none
C2 Both ends with factory fitted end angles

Fixing (accessory)
No entry: none
W00 Fixing brackets for fixing the diffuser to the wall (supplied separately)

Exposed surface
No entry: anodised, E6-C-0, natural colour
P1 Powder-coated, specify RAL CLASSIC colour

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

Colour of air control elements
No entry: similar to RAL 9005, black
WW Similar to RAL 9010, white

Order example: VSD35-3-AZ-AS-ZT-M-L/900/C2/W00/P1-RAL 9010/WW

Connection	With spring clip fixing
Acoustic lining (accessory)	With
Damper blade for volume flow rate balancing	With
Accessories	Lip seal
Nominal size	900 mm
End pieces	End angle
Fixing	Fixing brackets
Exposed surface	RAL 9010, pure white, gloss level 50 %
Colour of air control elements	White

Variants, Attachments, Dimensions and weight, Product details

VSD35-3-AZ

Black air control elements

End angles on both ends

VSD35-3-AZVSD35-3-AZ

Nominal length mm L_N	L₁ mm
600	600
750	750
900	900
1050	1050
1200	1200

Variant	P mm
VSD35-3-AZ	109

VSD35-3-AZ

VSD35-3-AZVSD35-3-AZ-ZT

Nominal length mm L_N	L₁ mm	L₃ mm	L₄ mm	ØD mm	C mm	E mm	m kg
600	600	595	622	78	40	150	3.9
750	750	745	772	78	40	150	4.8
900	900	895	922	78	40	150	5.6
1050	1050	1045	1072	78	40	150	6.5
1200	1200	1195	1222	78	40	150	7.4

Nominal length mm L_N	L₁ mm	L₃ mm	L₄ mm	T₃ mm	ØD mm	C mm	E mm	m kg
600	600	595	622	270	78	40	464	4.9
750	750	745	772	270	78	40	464	5.8
900	900	895	922	290	78	40	664	7.2
1050	1050	1045	1072	290	78	40	664	8.1
1200	1200	1195	1222	290	78	40	664	8.9

VSD35-3-AZ 00155766_0

VSD35-3-AZ

Profiles

A_eff: One-way angled air discharge (supply air)

Nominal length mm L_N	A_eff m²
600	0.0039
750	0.0049
900	0.0058
1050	0.0068
1200	0.0078

Installation details, Commissioning, Basic information and nomenclature

Slot diffuser installation with a fixing brackets

Installation opening

Installation and commissioning

Preferably for rooms with a clear height up to 4.0 m
For wall and bulkhead installation
Horizontal duct connection
If necessary, carry out volume flow rate balancing with the damper blade

These are only schematic diagrams to illustrate installation details.

Nominal length mm L_N	l mm	h mm
600	612	98
750	762	98
900	912	98
1050	1062	98
1200	1212	98

Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

Slot diffusers with plenum box and damper blade (variant -M): The damper blade can be adjusted even after the diffuser face has been installed.

Principal dimensions

ØD [mm]

Outer diameter of the spigot

L₁ [mm]

Length of diffuser without end pieces

L₃ [mm]

Length of plenum box

P [mm]

Width of diffuser face – with extended border, if any

B₃ [mm]

Width of plenum box

H₃ [mm]

Height of slot diffuser with plenum box, from the lower edge of the suspended ceiling to the upper edge of the plenum box

Y [mm]

Neck extension – The neck length results from a fixed length plus the neck extension

A [mm]

Position of the spigot, defined by the distance of the spigot centre line to the lower edge of the suspended ceiling

C [mm]

Length of the spigot

m [kg]

Weight

Nomenclature

f_m [Hz]

Octave band centre frequency

L_WA [dB(A)]

Sound power level of the air-regenerated noise

V [m³/h] and [l/s]

Volume flow rate

Δp_t [Pa]

Total differential pressure

All sound power levels are based on 1 pW.

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