Slim linear slot 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. SystemClean™ minimises ceiling smudging and diffuser condensation.

	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.
	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.
	Smudge minimiser: SystemClean™ creates a clean air screen either side of the diffuser, minimising soiling of the ceiling due to air borne contaminants from the room.
	Sweat inhibitor: SystemClean™ creates an air screen along the diffuser profiles either side of the diffuser, reducing the threat of condensation.
	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 – 70 L/s/m (14 – 250 m³/h/m)

Nominal length

• Up to 2000 mm
• Available with or without end flanges

Element width

• Flangeless: n x 31 mm, where n = number of rows (1 to 4 rows)
• Flanged: n x 31 + 36 mm, where n = number of rows (1 to 4 rows)

Discharge height

• 2.4 – 4 m

Features

• 1 to 4 slots
• 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
• Minimum discharge height 2.4 m

Function

The LTG Slim Microjet Linear Diffuser SystemClean™, type LDB 12/Clean, is a slim linear slot 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. SystemClean™ discharges clean air screens either side of the diffser that minimise ceiling smudging and diffuser condensation.

The diffuser may be flush mounted in a ceiling or freely suspended (ie no Coanda attachment to the ceiling required). The diffuser’s slots incorporate 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.

SystemClean™ includes a perforated hub that discharges clean, dehumidified supply air to screen the diffuser face from soiling and condensation due to humid air and air borne contaminants in the space. SystemClean™ enhances hygiene, maintains clean aesthetics, and effectively eliminates on-going cleaning costs. SystemClean™ is well suited to applications with a high concentration of pollutants (such as restaurants or near busy streets), in places of high humidity (such as the tropics or the coast) or where high infiltration may occur (such as lobbies and public spaces).

The LTG LDB 12/Clean 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.