Composition
The standard 127mm O.G. profile gutter is formed from 0.6mm Huletts 3SH4 aluminium alloy coiled sheet, which has a stoved PVF² (acrylic on epoxy primer) paint system on both sides. Fixing is by means of concealed hanger brackets of pressed aluminium.

Size
Downpipes are either –
Aluminium: 75mm x 50mm
Or P.V.C: 75mm x 60mm

Weight
0.5kg per metre run.

Thermal Movement
Co-efficient of linear expansion is 2.4 x 10-5 per °C. On very long runs expansion joints may be necessary.

Durability
Tests carried out in the UK by the Agrément Board have shown the paint finish to have a life expectancy of more than 30 years under normal conditions of climate and usage.

Chemicals
Huletts PVF² is not affected by chemicals in polluted atmospheres or by the impurities normally present in rainwater.