These aluminium louvre vents are available in the following sizes:
3 Slot 180x115mm h
4 Slot 180x150mm h
5 Slot 180x180mm h
6 Slot 180x215mm h
8 Slot 180x295mm h
10 Slot 180x350mm h
12 Slot 180x370mm h
14 Slot 180x475mm h
15 Slot 180x505mm h