Sand Trap Louvers


Sand Trap Louvers
  • Frame and blades: 1.5 mm and 1.2 mm thick high quality extruded aluminium profiles.
  • Bird screen: 12 mm x 12 mm x 1.5 mm dia aluminium wire mesh as standard. 12 mm x 12 mm x 1 mm dia G.I wire mesh as optional.
  • Drain: 20 mm dia self drain holes at the bottom of the louver.
  • Damper: Galvanized steel sheet construction.
  • Damper blades: High quality extruded aluminium profiles.


  • Manufactured from high quality extruded aluminium profiles with the advantages of corrosion resistance and rigidity.
  • Composed two sets of inverted U - channels mounted vertically on two opposite rows.
  • Drain holes of diameter 20 mm are provided in two rows at the bottom of the louver for emptying filtered sand and dust.
  • Fixed with a removable volume control damper to ensure positive control over the fresh air stream.
  • Damper can be operated manually from the back of the louver or can be motor operated.
  • Designed to separate and and dust from the air stream.
  • Generally used for ventilation applications and at inlet duct of air handling unit.

Standard Finishes

  • Natural anodized aluminium finish.
  • Powder coated color finish as per RAL color codes.
  • Flexibility of finishing available as option.

Standard Sizes

  • Available in square and rectangular sizes.
  • All combinations of width x height.
  • Non standard sizes are available.
Width in mm Height in mm
150 150
300 300
450 450
600 600
750 750
900 900
1050 1050
1200 1200
1350 1350
1500 1500
Installation Details

  • Concealed screw fixing as per the site conditions.

How to Order

Model Accessories Size Quantity Finish
ASTL F = Filter Specify listed size Width x Height in mm x mm Specify in numbers A = Aluminium anodized finish.
D = Damper
B = RAL 9010
C = Other RAL colors.
D+F = damper and filter

Ordering Example:

To select sand trap louver, damper and filter assembly, of size 1200 x 900 mm, quantity 75 nos, with aluminium anodized finish.

Order as: ASTL+F+D - 1200 x 900 - 75 - A.

Sand rejection efficiency:

Tests conducted on Model:ASTL at a face velocity of 0.5m/sec indicates a typical efficiency of

  • 90 percent on 200 to 700 microns.
  • 80 percent on 20 to 200 microns.
  • 50 percent on 1 to 70 microns.

Better efficiency can be achieved by sand trap louvers with washable aluminium filters.