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Sizing ducts and diffusers.

Sizing ducts and diffusers.

Sizing ducts and diffusers.

(OP)
I'm sorry, I did not provide enough info. for a more informed answer.
I have a 3 ton downflow unit,which I am converting to upflow because the floor diffuser ducts are rusted through.
The attic area space is very limited.  I was thinking about using the same furnace 'because it is almost new' and bringing a 12x16" (id.demension)ductboard , (which would have a capacity of 1200 CFM & 1000 FPM) off the supply side of the plenum. The plenum is below the "A" coil, so I would'nt be bypassing any air.
I thought I would use a combination of extended, radial system ductwork. I have figured and drawn out the ductwork and diffuser sizes until I am blue in the face and still don't know if I am right
I have seen on one of these posts where the person put their blueprints on this site where you could see it.
If I can do that you would be able to see what I am trying to do and tell me how far off I am.
Does anyone out there know I can put my drawing on this board ?

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