Door undercuts typically won t allow enough air to get out of the bedroom unless you leave a gap bigger than most people want under their doors.
Gap under bedroom door.
My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout.
But for finished conditions bedroom closets area with w to w carpeting ect 1 2 max.
I think it is too big and think a 1 4 1 2 gap would accommodate any unevenness in our floors and allow us to use area rugs.
In the winter they let cooler air in and in the cooling season when your air conditioner is.
Cheaper pre hung doors give about 1 1 25 clearance and this is because the rise of thinner floor systems for the mass consumer market.
The conventional wisdom on door undercuts.
How to fix a gap under a door.
Door gaps especially on exterior doors can be serious energy wasters.
There is an approximately 1 5 gap at the bottom of the doors.
Seal the gap under the door.
Higher quality pre hung doors are usually manufactured with 1 5 clearance under the door as described above assuming the flooring will be premium as well in the 3 4 range.