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For the base of the acoustic enclosure, I've used IKEA ALEX. Tight fit. Shelf used for a 12cm duct at the top.
I've used pair of Noctua NF-A14x25 G2 PWM Sx2-PP to pull air out 500RPM. That's quiet enough, but barely enough airflow. Instead of pulling, I should have hidden them inside a duct behind a baffle.I totally underestimated importance of baffles. I thought smooth airflow would be more important, but nope. Labyrinth matters more. Super important around both exhaust and intakes!