1.   Yeah because the pipe goes up there.

2.   Another way to protect pipes in a wall cavity is to put a vent in the wall where the pipes go up.

3.   But sometimes pipes go perilously close to a concrete or stone foundation.

4.   Plumbers know how the pipes go together.

5.   The pipe went through his wrist and severed the tendons and main nerve to his hand.

6.   The stove pipe went up through all the floors and out the roof.

7.   They are normally placed against outside walls in any room of the house, and the vent pipe usually goes through the wall directly behind the unit.

8.   Where pipes go through a very cold crawl space, it might be wise to use a special compressed fiberglass insualtion tube, which gives much more insulation.