VTU/VTI - Diffusers

General

EXHAUSTO VTU and VTI diffusers are used as part of a ventilation system, where there is a need for balanced air replacement. The diffusers can be fitted directly to an EXHAUSTO spiro tube using the bayonet mount supplied with the diffuser.

VTU extraction diffusers can be ceiling or wall-mounted. VTI supply air diffusers are designed to be fitted in the centre of the ceiling.

The diffusers are fitted with a rotatable valve disc, which makes it possible to set the air gap to the required capacity. A foam rubber ring glued to the diffuser ensures air-tightness between fitting and bayonet mount.

VTU and VTI are made from white-lacquered steel sheet - RAL9003.

Dimensioned drawings

VTU/VTI

VTU

Type	Nominal diameter Ød, mm	ØD, mm
VTU100	100	130
VTU125	125	160
VTU160	160	190
VTU200	200	245

VTI

VTI målskitse

Type	Nominal diameter Ød, mm	ØD, mm
VTI100	100	130
VTI125	125	160

VTU - Capacity diagrams

VTU

The drawings show the capacity with the control valve fitted in the pipe socket The drawings show volume flow qv (l/s and m³/h), total pressure drop p_t(Pa), and A-weighted sound power level (L_WA) for various settings a (mm)

VTU100

VTU125

VTU125 kapacitetskurve

VTU160

VTU160 kapacitetskurve

VTU200

VTU200 kapacitetskurve

VTI - Capacity diagrams

VTI

The drawings show the capacity with the control valve fitted in the pipe socket The drawings show volume flow qv (l/s and m³/h), total pressure drop p_t (Pa), Throw length L₀₂ (m) and A-weighted sound power level (L_WA) for various settings a (mm)

VTI100

VTI100 kapacitetskurve

VTI125

VTI125 kapacitetskurve

Sound data

VTU/VTI

Sound power level in octave band L_w (dB)
Sound pressure level L_w (dB) = L_WA + K_ok
The L_WA can be read off the capacity charts. The constant K_ok can be seen on the tables below.

VTU

Model	Average frequency (Hz)
	125	250	500	1000	2000	4000	8000
VTU100	-8	-5	-6	-6	-4	-12	-21
VTU125	-11	-4	-6	-7	-3	-16	-25
VTU160	-7	-4	-6	-3	-6	-18	-31
VTU200	-7	-6	-7	-2	-9	-18	-27
Tol. ±	3	2	2	2	2	2	3

VTI

Model	Average frequency (Hz)
	125	250	500	1000	2000	4000	8000
VTI100	2	2	-1	-6	-14	-25	-37
VTI125	2	4	-2	-7	-14	-25	-37
Tol. ±	3	2	2	2	2	2	3

Integrated sound attenuation ΔL (dB)

The fitting's integrated sound attenuation includes end reflection with the fitting connected to the duct.

VTU

Model	Average frequency (Hz)
	63	125	250	500	1000	2000	4000	8000
VTU100	21	16	9	11	9	8	8	12
VTU125	21	16	9	8	5	5	7	8
VTU160	19	13	9	6	5	4	6	8
VTU200	16	10	7	6	6	6	10	7
Tol. ±	6	3	2	2	2	2	2	3

VTI

Model	Average frequency (Hz)
	63	125	250	500	1000	2000	4000	8000
VTI100	22	17	11	9	8	9	6	9
VTI125	19	15	10	8	7	7	5	5
Tol. ±	6	3	2	2	2	2	2	3

Setting/Air volume

VTU

Valve fitted in		Setting A (mm), see the dimensional drawing
VTU100	a	-12	-9	-5	0	5
Duct 90° bend T-piece	k	0,560	0,938	1,46	2,00	2,72
		0,632	1,02	1,44	2,20	2,78
			1,08	1,54	2,17	2,91
VTU125	a	-17	-15	-12	-9	-6	-3	0	5
Duct 90° bend T-piece	k	0,681	0,868	1,45	1,72	2,33	2,73	3,31	3,95
		0,616	0,854	1,40	1,86	2,35	2,75	3,11	4,01
			1,13	1,56	1,97	2,39	3,00	3,40	4,19
VTU160	a	-20	-18	-15	-10	-5	0	6	10	12
Duct 90° bend T-piece	k	0,833	1,00	1,79	2,66	3,68	4,66	5,92	6,57	7,04
		0,879	1,09	1,71	2,62	3,63	4,59	5,68	6,61	6,90
			1,58	2,11	3,09	3,90	4,90	6,10	6,86	7,11
VTU200	a	-25	-20	-15	-10	-5	0	10	20
Duct 90° bend T-piece	k	2,39	3,65	5,02	5,77	7,18	8,39	11,4	13,7
		2,39	3,54	4,87	5,70	7,01	8,51	11,1	13,6
		2,39	4,04	5,15	6,33	7,58	8,45	10,9	14,3

VTI

Ø mm	Valve fitted in		Setting A (mm), see the dimensional drawing
VTI100	Duct	a	2	4	6	9	12
VTI100	Duct	k	1,00	1,10	2,31	3,19	4,12
VTI125	Duct	a	3	5	7	9	12	15
VTI125	Duct	k	1,23	1,85	2,83	3,74	5,08	6,21