here is what i have done with the core of my heat exchanger so

here is what i have done with the core of my heat exchanger so far, now i need to pick up the ductwork i am going to use and , print out some fittings for it, i will use this one until i print a bigger one i think.

What’s the purpose of it?

it is the core of a heat exchanger, so that the air that i blow out is heats up or cools down the air that is brought back inside.

i am building it for the fume hood that i am building for my printer