Passage Summary: You can't tell how well a vacuum cleans just by looking at the motor size because the filters work differently even on vacuums with the same motor.

Conclusion: One cannot accurately predict the cleaning effectiveness of a Delta vacuum cleaner based solely on its motor power.

Reasoning: Dust filtration efficiency varies significantly among Delta models, even when those models have identical motor power.

Analysis: There is a logical gap between 'filtration efficiency' and 'cleaning effectiveness.' The premises tell us that filtration varies, but they don't explicitly state that filtration is a part of what makes a vacuum 'effective' at cleaning. To guarantee the conclusion, we need an assumption that confirms filtration efficiency is a factor in overall cleaning effectiveness. Look for an answer that connects these two distinct concepts.