The URH exhaust valve shall have an adjustable central cone and collar made of polyester-epoxy-painted steel, with a white (RAL 9010) standard colour. The URH shall be fitted with a galvanised steel installation frame. Alternatively the valve shall be fixed with springs directly into a duct.

The supply and exhaust valve shall have a detachable front panel and collar made of polyester-epoxy-painted steel, with a white (RAL 9010) standard colour. The collar shall have fixing springs and comprise a sealing gasket to be fixed directly to the duct.

The exhaust unit shall have a telescopic casing made of galvanised steel. The unit comprises internal removable adjustment module and detachable perforated front panel.