Door insulation in a passivhaus - in particular pocket door

[puntloos]

As you might be aware, most passivhaus internal doors leave a decent strip of air gap below them, for ventilation reasons. 

But my telescopic pocket door from eclisse is taking this to a bit of an extreme - when 'closed' there is a 20mm gap between the door planks (not even mentioning near the floor)

 

 

Is there anything we can do here? Maybe some 'strip' system at the far front of door 1 and far back of door 2:

 

Or will this not structurally improve things because there are too many other air gaps?

Frankly I'm surprised these doors are designed in such an 'open' way.. 

Edited March 15 by puntloos