We now enter the main bud room with the 8" pipe all joints are sealed and taped as were using co2.
Using a factory 8x6x6 Wye fitting I terminate the fresh air intake feeding each hood with a very short piece of 6" flex but I use elbos at the fittings to reduce friction and turbulence.
I properly vented movable hood using 6" flex and an elbo and a long sweep. No short hard turns to restrict air flow.
The new hood straight through these hoods are cool to the touch.