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Gaps at the bottoms of interior doors......

Hello folks! New to these message boards so pardon my ignorance. 

Look for some direction regarding interior doors relative to the bottom gaps between the floor and doors needed/required for proper ventilation and circulation for my central heating and AC system return. All 3 BR doorways and 1 BA doorway are in the same hallway. The second BA doorway is located in the master bedroom.

the return air vent/grill is located in that same hallway on a wall (not ceiling mounted) at the very bottom right above the baseboard.

3 BR/2BA home on a slab; brick, hardwood floors(no carpet); 2,200 of living area; right at 3,200 total under roof. 

If I need to provide more information, please let me know ASAP. 


I live in South Louisiana along interstate 10.


Thanks in advance. 

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