1) Do not allow dirt or moisture inside the tubes
• Keep the open ends of all tubes capped until all tubes have been connected.
• The tube openings must be horizontal or downward.
2) When passing a tube through an opening in the wall, always keep the end of the tube covered.
3) Do not place the tubes directly on the floor. Do not rub the tubes on the floor.
4) When removing debris (removing burrs) from a tube, point the opening downwards, so that nothing falls into the tube.
5) When installing the tubes on a rainy day, always keep the ends of the tubes covered.
