TM 9-4940-444-14 & P
b. Telescopic Joints - when it is necessary to use a telescopic joint in order to raise the hood out of the way or for
vertical adjustment, the pipe connected to the hood shall have an inside diameter equivalent to the hood outlet,
and such pipe shall be able to slide inside the connecting pipe, which shall be just large enough for a close,
sliding fit. The inside pipe shall extend into the outside pipe at least one pipe diameter but never less than 61
when extended to maximum position.
All exposed or unprotected sheet metal equipment and structural members shall be painted with paints suitable to
prevent rust or corrosion.
In the event of conflict between these general instructions and design shown on
the certified prints for a specific Job, follow the prints.