feat: Adds omalley duct desig notes.

20260102180010.OMalley-Duct-Design.md

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+# OMalley-Duct-Design
+
+1. Timeline is to start demo early April if all goes as planned
+1. ERV vs. Ventilating Dehumidifier options
+   1. Possibly both
+1. Ok to place system near / under current laundry chute which will be a duct chase for second
+   floor.
+1. May be able to hit 3rd floor Den area from 2nd floor. The 3rd floor bedroom is going to be a
+   challenge due to how the joists are layed out but not much of a concern.
+1. Perhaps no duct to 1st floor bathroom.
+1. Move duct in kitchen near door
+1. Move duct in foyer near door.
+1. New central return