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Title: Be sure you know what you're getting - could be dangerous!
Review: The picture of this unit appears to be an older model. I had the silver version and it worked well for more than two years. It had a vent in the back to channel air out. The model I replaced it with is black (but still has the same PA248U model number on back), and is much more dependent on airflow from underneath. This means that as soon as you place it on an sofa arm or pillow or something, it will immediately start to audibly strain. However, it does provide a lot of airflow when unconstrained on a table or desk.But the final straw came when one of the fan blades started making a scraping noise. I lifted my computer up to see what was happening and - I kid you not - one of the fan blades came shooting out of the unit and landed two feet to my left. This thing was pointy and sharp and could have taken an eye out - if you're lucky enough to have it come out the top!I want my old silver one back... This one is being returned.
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