Single slot ultra-slim linear ceiling diffuser with alternating ultra-high induction micro-jet discharge. Manually adjustable barrel nozzles through 180° for 1-to-2 way blow, as well as horizontal through diagonal to vertical, air pattern adjustment. Suitable for installation flush with ceiling or free-hanging.

	Location – above: Integrated flush with a closed ceiling or freely suspended. Adjustable through 180° for 1-way blow to 2-way blow discharge patterns (horizontal to vertical). Minimum discharge height 2.4 m.
	Mixed flow discharge: High induction alternating micro-jet discharge from adjustable barrel nozzles located in linear slots intensely mixes supply air with room air. Strong supply air diltuion with rapid discharge velocity decay produces draught-free, high momentum supply air motion of uniform temperature distribution over short or long throws. Ideal for enhanced thermal comfort (ADPI ≥ 90%).
	Return air: Also suitable for use as a return air inlet.
	Low temperature supply: May be used for low temperature (cold air) supply systems (Tsupply ≤ 10 °C), where ∆Tsupply-room ≥ -16 K.
	VAV dependent throw: VAV throw dependent upon airflow rate. Minimum airflow dependent upon ∆Tsupply-room (eg turndown to 25% and ≈1 L/s/m2 @ ∆Tsupply-room ≈ -16 K).
	Adjustable direction: Air pattern direction adjustment via rotation of individual barrel nozzles through 180° for 1 or 2 way blow, as well as horizontal through diagonal to vertical, air patterns. Horizontal discharge provides draught-free cooling; vertical discharge provides effective heating even from elevated discharge heights.
	Manual adjustment: Air pattern adjustment is manual.
	Linear face shape: Aluminium extrusions provide continuous linear aesthetic, with or without side and end flanges.
	Slot face pattern: Barrel nozzles create linear slot appearance.
	Plastic Face: Adjustable black or white plastic barrel nozzles.
	Metal Face: Anodised or powder coated linear aluminium profiles.

Options

Plenums: Side-entry connection boxes with concealed diffuser fastenings.

Airflow rate

• 4 – 18 L/s/m (13 – 65 m³/h/m)

Nominal length

• Up to 1500 mm
• Available with or without end flanges

Element width

• Flangeless: 15 mm
• Flanged: 28 mm

Discharge height

• 2.4 – 3 m

Features

• 1-slot
• Adjustable 1 to 2 way discharge patterns
• Adjustable horizontal, diagonal or vertical discharge direction
• Ultra-high induction alternating multistream barrel discharge
• Barrels individually adjustable through 180°
• Barrels of plastic, black or white
• Side and end profiles of aluminium, natural anodised or powder coated
• Flanged or flangeless side and end profiles
• Installation flush with ceiling or free hanging

Function

The LTG Ultra-Slim Microjet Linear Diffuser, type LDB 12, is an ultra slim single slot linear diffuser incorporating a multitude of miniature barrel nozzle micro-jets that produce ultra-high induction. Individual barrel adjustment through 180° provides air pattern adjustability from 1-way to 2-way blow and from horizontal through diagonal to vertical discharge direction.

The diffuser may be flush mounted in a ceiling or freely suspended (ie no Coanda attachment to the ceiling required). The diffuser’s single slot comprises a multitude of miniature barrel nozzles with manually adjustable discharge direction adjustment to produce ultra-high induction discharge by breaking up the supply air stream into a multitude of micro-jets. The barrel nozzles are made of polycarbonate, dyed black or white, and are located in aluminium extrusions that are anodised or powder coated.

Micro-jet discharge creates ultra-high induction, providing many advantages. High aspiration at the diffuser face causes intense mixing, strongly diluting the supply air stream with large quantities of room air. Ultra high induction, additionally, intensely equalises the supply air stream temperature with room air, preventing cold air dumping. Rapid supply-to-room air temperature equalisation also improves heating performance by preventing the supply air from being too bouyant. The high induction produces a strong increase in supply air stream mass flow rate, as well as rapid discharge velocity decay. At any given airflow rate, the LTG LDB 12 diffuser is suitable both for long throws (due to the supply air stream’s high momentum) as well as short throws (due to the supply air stream’s low velocity). Ultra-high induction airflow is characterised by extremely uniform temperature distribution and exceptionally high levels of draught-free comfort in the occupancy space.

The LTG LDB 12 diffuser may be used in CAV systems as well as VAV systems that turn down to as low as 20%, including low-temperature supply air systems with ΔT_supply-room ≥ -16 K. Minimum turndown = 25% at ΔTsupply-room = -16 K. Due to high induction micro-jet discharge, the effective air changes per hour in the space are increased, allowing minimum specific airflow rates as low as approximately 1 L/s/m² when the diffuser is fully turned down, whilst maintaining enhanced comfort of 90% ADPI. Due to the rapid discharge decay characteristics of the micro-jet discharge, a high maximum specific airflow rate of 15 L/s/m² may be achieved at 90% ADPI.