Square Ceiling Diffusers LFD

Model LFDLFD

SquareCeilingDiffuserLFD2 SquareCeilingLFD 2WayOpposite SquareCeilingLFD 2WayCorner SquareCeilingLFD 4WayBlow 247084 SquareCeilingDiffuserLFD CDia
SquareCeilingDiffuserLFD2 SquareCeilingLFD 2WayOpposite SquareCeilingLFD 2WayCorner SquareCeilingLFD 4WayBlow 247084 SquareCeilingDiffuserLFD CDia

LFD type base is for flush mounting under a plaster ceiling or within a T-Bar ceiling.

Application:

This square ceiling diffuser is designed to achieve an even supply air distribution from any type of ceiling.

Construction:

Aluminium.

Standard Finish:

Powder Coat White RAL9010

Features:

  • Louvre faced ceiling diffusers are all aluminium including the frame, blades and centre core.
  • LFD’s are lightweight and will not rust or corrode under normal usage.
  • Suitable for flush mounting under a plaster ceiling or lay-in T Bar ceiling grids.
  • Removable core and safety chain makes them easy to install, clean & access dampers located behind diffusers.
  • The LFD range is suitable for heating, cooling or ventilation in commercial and domestic applications.
  • Diffuser ratings are based on mounting height being 2.8 metres. Throw range is defined by the minimum and maximum horizontal distances at right angles to the side of the diffuser.

 SquareCeilingDiffuserLFD CorePatterns

Sizes Available
Item Number Description Nominal Neck / Face
248001 LFD 150 x 150mm 4 way 150 / 300
248002 LFD 225 x 225mm 4 way 225 / 375
248003 LFD 300 x 300mm 4 way 300 / 450
248004 LFD 375 x 375mm 4 way 375 / 525
248005 LFD 450 x 450mm 4 way 450 / 600

Notes:

The above sizes are based on a 4-way throw

3-way x Air Quantity x 0.75.
2-way x Air Quantity x 0.50

 

 247084 SquareCeilingDiffuserLFD CDia

NECK SIZE
(mm)

Airflow (L/s) Velocity (m/s)

STATIC
PRESSURE
DROP (Pa)

NR (dB)

Minimum
Throw (m)

Maximum
Throw (m)

225x225

100 2 15 <22 0.5 1.5
150 3 35 28 1.4 3.2

 

300x300

150 1.7 12 <22 0.9 2.7
200 2.2 19 23 1.4 3.3
250 2.8 31 26 2.2 4.2
300 3.3 42 31 2.8 4.6

 

375x375

250 1.8 13 <22 1.3 3.4
300 2.1 18 <22 1.5 3.9
350 2.5 26 28 1.7 4.6
400 2.9 32 31 2.1 5
450 3.2 39 35 2.7 5.2

 

 

450x450

350 1.7 12 25 1.2 3.8
400 2 15 26 1.4 4.2
450 2.2 20 29 2 4.8
500 2.5 25 32 2.7 5.4
550 2.7 30 33 3.1 5.8
600 3.0 35 35 3.5 6.2

NOTE: The above sizes are based on a 4-way throw

3-way x Air Quantity x 0.75
2-way x Air Quantity x 0.50

 

Opposed Blade Dampers - Effect of Volume Control on Noise Levels

The additional noise level for diffusers with Opposed Blade Dampers installed is set out in the following table:

NR Addition for OBD
Diffuser with OBD Fully Open 50% Closed
NR 25 or less 1 5
NR 30 1 6
NR 35 2 8