Qmax is available 5 sizes, 225, 350, 550, 700 and 900 and so ensure greater system flexibility for designers and engineers to optimize the scheme hydraulics. With a choice of edge rail designs in ductile iron or galvanised steel, ACO Qmax system can be tailored for use. The Qmax range is CE marked and certified to BS EN 1433:2002 and supports all Load Classes up to and also including F 900.