Here’s a 280mm diameter air distribution plenum for the ceiling of vans or PSVs.
It is fitted with four 73mm diameter rotating, directionable vents.
Four 4mm mounting holes @ 260mm centres. 8mm rear projection when vents are fully open.
Requires 210mm diameter hole behind for clearance if vents are fully open.
CIRCULAR ROOF VENTILATION PLENUM WITH FOUR VENTS #CPLEN280