Wasn’t that the calculation I showed?
The 100 mb differential pressure between the inside of the vortex and the shelter chamber?
Of course we totally neglected any pressure equalization that would occur because the door is likely poorly sealed.
But it does give a bit of insight into the forces acting.
Or what we call in Indiana “farmer math”
The door seals pretty good actually. I mean it won’t rain in and water won’t run in it. But it has two 4 inch air vents in the cellar. PVC pipe inside those tin vent covers.
Your math was fine. Only ‘protesting’ the use of the verb “suck”. ;-)