TM 9-4940-444-14 & P
3. Vertical Runs:
Vertical runs of piping through floors shall be set in flange tips at each floor level. Flange tips shall be securely
fastened to floor. The flange tip shall be made from the same kind of material and two gages heavier than the
connecting pipes. High vertical runs of piping shall be supported laterally to prevent vibration and displacement.
4. Discharge stacks: Discharge stacks from dust collection equipment and exhaust fans shall be securely fastened
to the building structure. Flange tips shall be used in the same manner as provided for vertical runs of piping if the
discharge stack passes through the floors. Upper and lower roof flanges of the same material and thickness as
the stack shall be used at the roof line if the stack passes through the roof.