PDQ-AII roof bases provide a connection between square ductwork and a roof ventilator or exhaust vent. The bottom part is an extended square duct, fabricated to the ordered size (max. 1400x1400 mm). The top part of the standard version is designed for installation on flat roofs and made of PQ30 frame angles to fit square air intakes and exhaust units. The roof base is also available, on request, in stainless steel or aluminium sheet.
