Expression/term for space between door and floor/wall

Door gap is the general name for all of the gaps around the door.

The best method for measuring door gap dimensions is to use a tool of the appropriate thickness that can be inserted between the door frame and door, the door and the floor, and between opposing vertical edges (aka, meeting stiles) of paired doors. (Doorgapgauge.com, emphasis added)

At idighardware.com, the sdi fact file is quoted, calling the gap at the floor

FLOOR CLEARANCE: The distance between the bottom of the door and the top of the material directly below the door. This varies with applications, such as concrete, any floor covering and/or a threshold.

This gap is also called bottom clearance, and the top gap is called head clearance, while the side gaps are called stile clearances at taylordoors.com.

To class them all together, you could say "The smoke is seeping through the door gaps."

I can't find anything shorter than a long phrase:

• smoke stream/ing/ed/ in through the chinks of the door where it meets the frame.