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  2. 30 of the best Valentine's Day gifts for him - AOL

    www.aol.com/lifestyle/best-valentines-day-gifts...

    This vintage-inspired radio from Victrola — one of the leading turntable manufacturers of the early 1900s — is Bluetooth compatible, giving him the best of what’s new and old. Use one dial ...

  3. 15 genius finds to help you survive cold and flu season

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    The Jisulife Handheld Mini Fan gives you that blast of cool air that you need. This handy number also boasts 21 hours of battery life, a backup charger and it's a flashlight.

  4. Cool Down Your Space From Above With These Editor-Recommended ...

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  5. Centrifugal fan - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_fan

    Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

  6. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The output of the infrared LED (like that of any infrared remote) is invisible to the human eye because its wavelength is beyond the range of visible light (940 nm). This system is commonly used on mini-split air conditioners because it is simple and portable. Some window and ducted central air conditioners uses it as well.

  7. Ducted fan - Wikipedia

    en.wikipedia.org/wiki/Ducted_fan

    The high-bypass turbofan engines used on many modern airliners is an example of a very successful and popular use of ducted fan design. The duct increases thrust efficiency by up to 90% in most cases [citation needed], in comparison to a similar-sized propeller in free air. Ducted fans are quieter, and offer good opportunities for thrust vectoring.

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