2. A ventilation panel known as a sunshade can be installed. It should only be installed with the hatch closed or open at the rear.
3. Maintenance consists of regularly checking that the drain hoses at their lower ends are not clogged (see Figure 11.69), see photo 48.3.
4. There is no need for lubrication or any other regular maintenance.
Figure 11.68. Manhole cover crank - release button indicated by arrow
Figure 11.69. Manhole cover drain hose locations
Photo 48.3 Water drain point when installing a sliding/sloping manhole cover. Check with a wire whether the hole is clogged
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