Operating Louvres

Series 3000 Standard Blade Types: 3140 & 3160
Series 3000 Weather Resistant Blade Types: 3540 & 3560
Coefficient of Discharge:
Types 3140 & 3540: 0.63
Types 3160 & 3560: 0.68

Robertson Series 3000 Operating Louvres are factory assembled units available in a wide variety of materials. They are infinitely controllable between fully open and fully closed positions, providing the most effective form of controlled air replacement. These louvres are designed as single units for small openings or multiple units for large openings. Robertson Operating Louvres can be operated singly or in banks.

Design Features


The wide selection of colours and materials available enables architects to blend the louvre with other building materials. A simple, rugged design gives minimum static pressure drop loss when in the open position, yet offers excellent resistance against weather penetration. To minimise maintenance, the louvre blades pivot on nylon brushes.

Standard Louvre Heights (mm)

  Standard Blade Weather Resistant Blade
No. of Inter. Blades Type 3140 100 deep Type 3160 150 deep Type 3540 100 deep Type 3560 150 deep
*2 520 710 639 846
3 635 875 779 1036
4 750 1040 919 1226
5 865 1205 1059 1416
6 980 1370 1199 1606
7 1095 1535 1339 1796
8 1210 1700 1479 1986
9 1325 1865 1619 2176
10 1440 2030 1759 2366
11 1555 2195 1899 2556
12 1670 2360 2039 2746
13 1785 2525 2179 2936
14 1900 2690 2319 3126

* Denotes minimum dimensional limitation.
NOTE: Standard heights shown give maximum free inlet area.
However, louvres can be manufactured to suit any opening dimensions.
Weight (in steel with Standard Operating System): l00mm deep 16 kg/m2, 150mm deep 18 kg/m2.