The units have blades centres between 40 and 200mm as required and can be manufactured from 304 or 316L stainless steel:mill finish aluminium or marine grade aluminium:black or hot dip galvanised mild steel, Mill finish extruded aluminium blades can also be supplied. All units can be wet painted or powder coated

12mm Mesh pre-galvanised M.S., Stainless steel or aluminium bird guards can be fitted to the rear of the blades.

Sizing of the weather louvres is normally based on an air velocity of 1000 FPM (5 m/sec) which would give a pressure drop of approx 0.25” wg on blades at 75 crs.

These consist of a 4 sided weather proofed enclosure, to fit over a roof aperture, which contains a bank of fixed blade weather louvres in one to four of the sides. Materials avialable for construction are the same as the fixed blade louvres.

These are manufactured to any material mentioned for fixed blade weather louvre and consist of vertical channel section blades to stop the ingress of sand or large dust particles.

These should be sized on a maximum face velocity of 400 FPM (2m/sec).

Our sales staff would be happy to answer any enquiry you may have regarding our products.