The flow dropped from an unrestricted 150 160 cfm down to under 100 cfm in each room.
Gap under bathroom door.
But for finished conditions bedroom closets area with w to w carpeting ect 1 2 max.
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.
The jumper makes sense in some cases.
Door gaps especially on exterior doors can be serious energy wasters.
Further operation of the door structure depends on how well gaps will be calculated and put.
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.
My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout.
It s often not wisdom at all and you may get different versions of it depending on which convention you believe.
In the winter they let cooler air in and in the cooling season when your air conditioner is.
Standards and rules of gaps formation between a door and a frame.
My mom has a house with a central return and as you suggest her doors have about a 1 5 gap underneath to allow air to flow.
The conventional wisdom on door undercuts.
That said i have seen most door gaps set to 1 2.
Under the influence of moisture door can expand and then problems with its functionality cannot be avoided.
My remodel contractor installed my doors with the full door jam which left 1 plus of gap at the bottom of all the doors.
There is an approximately 1 5 gap at the bottom of the doors.
In my opinion it is better to have to trim the bottom of a door slightly when installing it than to have to lengthen it.
This is less than desirable in bathrooms and bedrooms.
Its just good practice for a builder to make sure the door doesn t drag on the carpet prior to handover.
How to fix a gap under a door.
A 10mm gap under the bathroom door is very usefull it allows the fan to work easier as it can draw in air and because its from within the house it stops the bathroom.