The CDQ-B roof-mounted air intake box is used in intake ventilation systems as the termination of ventilation ducts. It has stable leaves with a mesh which protects the installation against contaminations from outside. The box is made of galvanized steel sheet. The flange is made of a frame composed of sheet profiles PQ and corners NQ. The roof air intake is provided with a 12,7 x 12,7 mm large galvanised steel mesh to protect the inlet against dirts
