TM 9-4940-444-14 & P
EXHAUST PIPING INSTRUCTIONS - cont
If the stack is located on the outside wall of the structure, it shall be securely strapped to the structure with heavy
band steel not less than 2" x 3/16" in size.
Discharge stacks, located where it is impossible to fasten them to the building structure, shall be guyed to resist
wind pressure with heavy galvanized wire or cable provided with galvanized iron turn buckles for adjusting slack.
Connect to permanent points of anchor or heavy angle iron braces, made to substitute for the guy wires or cables,
providing the braces are permanently attached to a substantial anchorage. The band around the stack for
attaching the guy wires or cable braces shall not be less than 2" x 3/16" band steel.
F. Piping Cleanout Facilities.
1. Cleanout Holes:
All horizontal runs of piping shall be provided with cleanout and inspection hand holes at approximately every 20 ft.
They shall be of a size that will permit ready access to the interior of the pipe. They shall always be located before
an elbow going into a vertical run and after an elbow in the horizontal run. Hand holes shall be on the under side
of the pipes wherever possible. The holes shall be tightly covered with heavy gage material of the kind used in the
pipes, and should be of the sliding type and shall be close fitting. They must not offer any obstruction on the inside
of the pipe.
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