'They need to add some vents, perhaps controllable on th
You obviously think like a Dyson design-engineer; they already did!
On the right is the Dual Cavity FlatOut tool, as seen on the new DC26 City. The little round disk on the nozzle is a spring-loaded valve. It automatically balances airflow/suction depending on the surface you're using it on (obviously, different floor-coverings allow for different amounts of airflow).
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