Air principle
From outlet to occupied zone.
At the outlet
Fixed swirl vanes between the outer cylinder and the core tube set the air turning and mix it turbulently. (DS 4033 E p. 2)
In the room
The guide ring sets the direction. For cooling the jet runs horizontal, for heating it points straight down. The jet straightener in the ring gives the warm air a large vertical penetration depth. (DS 4033 E p. 2)
Construction
Outer cylinder, core tube, rounded outlet and fixed swirl vanes. The guide ring moves axially over a stroke of 0 – 80 or 0 – 120 mm, by hand or by actuator. (DS 4033 E p. 2–3)
The DD-VL
With a guide ring.
A twist outlet for high rooms whose guide ring tilts the jet steplessly, from horizontal for cooling to vertical for heating. Same base as the DD-VG, without the jet straightener.
Applications: high rooms and halls without significant contamination; thanks to its acoustics also broadcasting studios, theatres and concert halls (p. 2).
Technical data DD-VG
- Discharge height · DD-VG
- 3 – 28 mp. 2
- Max. ΔT cooling
- −10 Kp. 2
- Volume flow
- 600 – 11 000 m³/hp. 2
Krantz Components, Variable twist outlet with jet straightener DD-VG, DS 4033 E 06.2019.
Page numbers are PDF pages of the data sheet.
Download documents
Air
| Property | Value · Source |
|---|---|
| Air distribution | turbulent mixing ventilation; discharge direction adjustable from horizontal to vertical DS 4033 E p. 2 |
| Volume flow | 600 – 11 000 m³/h p. 2 |
| Volume flow per size | DN 315: 610 – 1,980 · DN 400: 1,010 – 3,490 · DN 500: 1,510 – 5,510 · DN 630: 2,990 – 9,000 · DN 710: 3,960 – 11,000 m³/h p. 2 |
| Max. ΔT cooling | −10 K p. 2 |
| Max. ΔT heating · DD-VG | +20 K (with jet straightener) p. 2 |
| Max. ΔT heating · DD-VL | +15 K (with guide ring) p. 2 |
| Discharge height · DD-VG | 3 – 28 m (DN 315: 3 – 15 · DN 400: 4 – 20 · DN 500: 4 – 22 · DN 630: 5 – 25 · DN 710: 6 – 28 m) p. 2 |
| Discharge height · DD-VL | 3 – 12 m (DN 315: 3 – 9, DN 400: 4 – 10, DN 500: 4 – 10, DN 630: 5 – 11, DN 710: 6 – 12 m) p. 2 |
| Sound | example DN 630 with jet straightener, 7,500 m³/h per outlet at 20 m: approx. 75 dB(A), 130 Pa; further in tables and nomograms p. 4, p. 8 – 10 |
| Penetration depth | not given as a separate figure; follows from the discharge height per size p. 2 |
| Example sound and pressure drop · DD-VL | DN 315 on duct, horizontal, 1 000 m³/h: 27 Pa, 39 dB(A) p. 7 |
Design
| Property | Value · Source |
|---|---|
| Versions | DD-VG with jet straightener · DD-VL with guide ring, without jet straightener DS 4033 E p. 2, p. 11 |
| Sizes | DN 315 · 400 · 500 · 630 · 710 p. 3 |
| Outer diameter / weight | ø D1 314 – 709 mm; face ø D4 565 – 1 278 mm; 6 – 20 kg (without plenum box) p. 3 |
| Material | main parts aluminium, powder-coated to RAL; plenum box galvanised sheet steel p. 11 |
| Connections | directly to circular duct (EN 1506) with L-brackets; via plenum box with spigot; or via spigot to the underside of a rectangular duct (by others) p. 2 |
| Adjustment | manual or electric actuator (types in the type code) p. 11 |
Versions and sizes
Five sizes, for halls up to 28 m.
- DN 315
- DN 400
- DN 500
- DN 630
- DN 710
DS 4033 E p. 3
Finish
aluminium, powder-coated to RAL (p. 11)
Installation
free-hanging or flush with the ceiling, above the occupied zone (DS 4033 E p. 3, p. 11).
Sibling
without the jet straightener it is the DD-VL (same base, 3 – 12 m) (p. 2, p. 11)
Applications
Where it belongs.
High halls such as exhibition halls and paint hangars, in commercial and industrial buildings (DS 4033 E p. 2). Discharge height runs up to 28 m depending on size (p. 2).
When not: If the outlet sits lower than 3 m, look at the DD-N (2.2 – 4.5 m, DS 1175 E p. 4). If no large vertical penetration is needed, the DD-VL is enough (3 – 12 m, +15 K, DS 4033 E p. 2).
Related in the collection
Same family, a different character.
| Type | What it is | Essence | Source |
|---|---|---|---|
| DD-VL | Variable twist outlet with guide ring | same outlet without jet straightener; 3 – 12 m; +15 K | DS 4033 E p. 2 |
| RA-V2 | Adjustable radial swirl diffuser with core tube | supporting jet via a damper in the core tube; 2.8 – 15 m | DS 4122 E p. 2 |
| DW-V2 | Swivel jet nozzle | wall or column instead of ceiling; throw up to 50 m | DS 1235e p. 2, p. 15 |
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