Is it possible for roofers to accidently dislodge a heater vent?

Could a properly installed heater vent be dislodged accidently by roofers?

A B-vent can come loose if you get too rough raising the rain collar and flashing. If the sections are locked and the pipe is supported and screwed to the furnace, it shouldn’t. Water heaters are another story, not much holding the draft hood in place.

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