Gas flow diverter

A gas flow diverter for directing gas flow through ductwork at a junction between a first passageway and a diverging passageway, comprising

• a housing, defining a first port through which gas flows to the first passageway, a second port through which gas flows to the diverging passageway, and a junction space between said first and second ports,
• a diverter blade, rotatably mounted in the housing to pivot through the junction space,
• a turning vane assembly, rotatably mounted in the housing to pivot through the junction space and into said diverging passageway,
• a drive shaft adapted for receiving torque from a drive mechanism, and
• a toggle assembly, comprising a turning vane toggle joint, fixedly mounted on the drive shaft and pivotally linked to the turning vane assembly, and a diverter toggle joint, fixedly mounted on the drive shaft and pivotally linked to the diverter blade, said toggle assembly adapted to transmit torque from the drive shaft to the diverter blade and the turning vane assembly so that the diverter blade and the turning vane assembly are rotated synchronously between a first position, in which the diverter blade closes the second port and the turning vane assembly is positioned in the diverging passageway, and a second position, in which the diverter blade closes the first port and the turning vane assembly is positioned in the junction space.