Return air plenum on minisplit
So after going back and forth with my engineer we settle on a solution for my return air side. Just curious if anyone has any advice or suggestions to this solution
I’ve planned for a central return in the foyer that is almost dead center and has the doorways to all 3 bedrooms.
The idea is to come off the unit return 5″x30″ with a filter rack that increases to 10×30 to accommodate the filter. This would be left open in the condition attic with a simple square or rectangular duct pass through from the space below. Similar to how fujitsu has in the install manual, although this is probably considering the unit is in a closet.
My concern is most have recommended oversizing the filter, but there would be no bends or turns on the return ducting, just a box off a box essentially. If this is feasible I’d like at least a 1″ filter perhaps 2″
Fujitsu provides a simple filter for this application but not totally sold on it so this was the solution we came up with.
Will this pass through exchange enough air from the space below? Not just attic air.
My designer approved this setup just wanted ask the community here with some real world experiences.
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