LSD • LSD Linear Slot Diffuser

Series LSD linear slot diffusers are a consistently popular diffuser series, well regarded due to their modern understated appearance, high air handling capacity and ability to perform both supply and extract functions.

Normally fitted into ceilings or at high level in sidewalls, slot diffusers are particularly suitable for installation in large open plan areas like offices or shopping centres. Through the use of multiple sections of diffuser, runs of unlimited length can be created.

Available with either a standard flanged or plaster-in frame, with 1 to 8 slots and a full range of options including internal deflectors to enable throw direction adjustment, end caps and polyester powder coating to any RAL or BS colour.

Linear slot diffusers are normally supplied complete with a specially adapted plenum box (side entry as standard) and brackets to suit. This not only connects the diffuser easily and effectively to ductwork, but also provides a discreet fixing method, avoiding any visible face fixings.

Diffuser options

Internal deflector blades

Recommended for supply applications, internal deflectors are anodised matt

black aluminium profiles factory fitted into each slot. Manually adjustable

through the diffuser face, they allow the direction of airflow to be altered as

required through the creation of low pressure zones beneath extended blades.

End caps

End caps incorporate a 19mm flange, contain the airflow within thediffuser, and

finish off the installation aesthetically. Supplied in the same finish as the diffuser

and factory fitted. Flat end caps are standard fit with diffusers specified with a

plaster in frame.

Mitred corners

Mitred corners can be supplied for when the building design requires an unbroken

length of diffuser, even through corners. Mitred corners are normally supplied as

a 90° angle, but can be manufactured to any angle if required.

Slot box options

Spigot mounted volume control dampers

NCA Series 900 SBD single blade dampers can be factory fitted into slot box spigot/s.

Dampers are fitted with a locking quadrant as standard, and are available with

actuators or lengths of cord for remote operation if required.

Fixing lugs

Factory fitted to the sides of slot boxes, fixing lugs enable use of slot boxes with drop rod

fixing systems. Lugs protrude 40mm from each side of the box, and have centrally

pre punched holes of 10mm diameter.

Internals painted matt black

Slot boxes can be sprayed matt black internally if required.

Equalising plates

Designed to equalise airflow throughout the length of the slot box, equalising plates

consist of a factory fitted piece of perforated steel sheet positioned in front of the

spigot. By forcing air to spread out into the whole box, a more equal flowthrough

the diffuser length is created, rather than majority exitingthe diffuser where the spigot is located.

Internal insulation

To aid both thermal and acoustic performance, slot boxes can be internally lined with

10mm black self-adhesive foam insulation. Slot box insulation can reduce cross-talk

between rooms, absorb noise from air handling units and prevent damage to building

fabric due to condensation. Insulation is a closed cell type ensuring minimal absorption

of moisture, and is Class O rated when tested against BS 476 pt 6 2000.

Fixings

Goalpost brackets

Required to connect a linear slot diffuser to a slot box.

With the box pre fitted into the aperture, brackets should be fitted to the diffusers using

the supplied M4 machine screws. When the diffuser is pushed up into the box, the flared

legs of the bracket will latch into the returns on the inside of the slot box. The bolts can

then be tightened to draw the diffuser up snugly into position. Goalpost brackets cannot be used if the diffuser is fitted with an OBD (opposed blade damper).

Plasterboard ceiling goalpost brackets

Adapted from standard goalpost brackets, plasterboard ceiling goalposts have a 10mm flat extension on each leg. This permits diffusers to be fitted straight into plasterboard ceilings,

without the requirement for a slot box. Plasterboard goalpost brackets cannot be used if the diffuser is fitted with an OBD (opposed blade damper).

• EC - End Caps.
• DEF - Deflector
• SEPB - Plenum Box.
• SBD - Single Blade Damper in spigot.