- w6 w7 w9 w10 w11 the exterior aluminium louvers is equivalent to modet-lsm / architectural line (hiddenmullion) range, titanium color coating no front blade and natural anodized na 1 color coating on rear blade. product of rasika international. the movable fiberglass insect screen, powder coating-c 130102 a aluminium frame, is required to be installed at the back of the louvers.