DR Power Walk-Behind 6.5 (Pre-August 2010) - Manual (Page 25)

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Vacuum Nozzle Door Operation
Figure 11 illustrates how the Vacuum Nozzle Door adjusts for the maximum performance under various
applications.
Nozzle Door fully opened. This is ideal for turf application.
Nozzle Door opened half way. This is ideal for hard surface application.
Nozzle Door closed for the OPTIONAL Hose Kit. This is ideal for hard to reach places.
Figure 11