This one caused a lot of confusion when I was a kid. My parents reasoned that the big guy wouldn't make it down a fireplace chimney either, so they stuck to their story and said he came down the furnace chimney. Once magic enters the picture then there's not much difference between a narrow steel pipe and an 8x12" tiled flue.

Please don't tell me you have a direct-vent furnace.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8