Clearly, paulb, you have missed both the movie, The Santa Clause, and the Twisted Christmas song, There's Something in the Chimney.

In the movie, we learn that Santa carries a fireplace with him, to access all abodes. And in the Twisted Christmas song, we learn that Santa got stuck in the chimney and died, anyway. HO HO HO

Because there's something in the chimney
And we don't know what it is
But it's been there all year long

I'll be waiting up for Santa
Like I did last year
But my brother says
He's already here...