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Sand Trap Louver With Damper And Filter - ASTL+D+F
Sand trap louver with damper and filter - ASTL+D+F Sand trap louver with damper and filter - ASTL+D+F


  • 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.
  • Filter frame: 20 gauge aluminium sheet.
  • Filter media: Aluminium mesh.


  • The frame and blades are of 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 which ensures positive control over the fresh air stream.
  • Damper can be operated manually by a projected lever or can be motor operated.
  • Aluminium filters with washable expanded aluminium media, as the filter media are available in 12, 25, 40 and 50 mm thickness as required.
  • 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.


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

  • 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.