VDP

Adjustable ceiling swirl diffuser with high induction

Swirl diffuser with high primary induction and internal control cone for various distribution patterns
Available in a circular or square design
Direction of high air flows can be adjusted manually or via electric motor
Heating and cooling operation at ceiling heights of up to 5 m without the need to change the direction of the distribution pattern
Plenum box with horizontal or vertical duct connection
Non-painted as standard

Design

The VDP swirl diffuser is a ceiling diffuser with high primary induction and an adjustable control cone for changing the distribution pattern. The diffuser is available with a horizontal or vertical duct connection.

The diffuser consists of a circular or square plenum box containing a cylindrical swirl element, an adjustable control cone, and a circular outlet diffuser that may be integrated or separate.

The control cone can be adjusted manually or with an electric motor (Belimo LH 24A-MP60). Infinitely variable control is achieved through a 0-10 V control signal.

Functionality

The cylindrical swirl element generates a circulating flow within the plenum box, causing negative pressure to build up at its center. This negative pressure draws room air into the diffuser outlet, where it mixes with the supply air. As a result, energy is exchanged and temperature differences are reduced.

This effect is further enhanced by the induction of secondary air along the air discharge edges, creating almost isothermal conditions even at a short distance from the outlet diffuser. Due to the minimized temperature differences in the horizontal distribution pattern and the high level of primary air induction, stable room air rolls are formed regardless of the installation method, whether flush with the ceiling or suspended.

Consequently, the air diffuser is suitable for both heating and cooling modes in rooms with ceiling heights up to 5 meters, without needing to change the direction of the distribution pattern. For rooms with ceiling heights exceeding 5 meters, the distribution pattern can be shifted from horizontal to vertical using the adjustable control cone.

Therefore, the swirl diffuser is especially well-suited for alternative heating and cooling applications or for adjusting the air infiltration depth with variable air flows or temperature differences.

Material and surface treatment

Adaptation

Planning

Specification text

Swirl diffuser VDP with high primary induction and an adjustable control cone with the following features:

Circular or square design with horizontal or vertical duct connection, made of galvanised steel.
Control cone adjusted manually or by electric motor (Belimo LH 24A-MP60).
Internal cylindrical swirl element made of galvanised steel, painted black.
Integrated or separate outlet diffuser made of aluminium.

Horizontal jet
Size	LWA = 30 dB		LWA = 35 dB		LWA = 40 dB		LWA = 45 dB		Operating range
Size	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	Vmin (m³/h)
20	168	10	232	18	278	26	365	44	100
25	328	14	374	19	441	26	530	38	280
31	622	21	722	28	842	57	1040	57	560
35	848	25	974	33	1130	44	1390	68	680
40	1210	31	1400	42	1600	54	1950	83	900
46	1790	39	2090	53	2350	67	2930	105	1200

Vertical jet
Size	LWA = 30 dB		LWA = 35 dB		LWA = 40 dB		LWA = 45 dB		Operating range
Size	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	V (m3/h)	∆p (Pa)	Vmin (m³/h)
20	154	12	180	17	208	22	258	34	100
25	288	17	339	24	390	32	483	49	280
31	557	26	659	36	755	48	934	74	560
35	750	31	881	43	1010	57	1250	88	680
40	1100	39	1300	54	1490	73	1840	111	900
46	1630	50	1920	69	2200	91	2730	141	1200

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Include Accessory documents

Document	Product	Document type	Download
Adjustable ceiling swirl diffuser with high induction (pdf 640.35kB)	VDP	Technical catalogue

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