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  2. Ceiling fan - Wikipedia

    en.wikipedia.org/wiki/Ceiling_fan

    Ceiling fans were proven to have a more significant effect on the droplet and airborne transmission when the coughing infected person is located directly under the ceiling fan. Ceiling fans offer better protection from cough exposure for people located closer to the fan center, where the directed airflow changing particle trajectory downward to ...

  3. Fan (machine) - Wikipedia

    en.wikipedia.org/wiki/Fan_(machine)

    Domestic extractor fan: Wall- or ceiling-mounted, the domestic extractor fan is employed to remove moisture and stale air from domestic dwellings. Bathroom extractor fans typically utilize a four-inch (100 mm) impeller, while kitchen extractor fans typically use a six-inch (150 mm) impeller as the room is often bigger.

  4. Specific fan power - Wikipedia

    en.wikipedia.org/wiki/Specific_fan_power

    Specific Fan Power (SFP) is a parameter that quantifies the energy-efficiency of fan air movement systems.It is a measure of the electric power that is needed to drive a fan (or collection of fans), relative to the amount of air that is circulated through the fan(s).

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    Overlay combines Multiply and Screen blend modes. [4] Where the base layer is light, the top layer becomes lighter; where the base layer is dark, the top becomes darker; where the base layer is mid grey, the top is unaffected. An overlay with the same picture looks like an S-curve.

  7. Ceiling projector - Wikipedia

    en.wikipedia.org/wiki/Ceiling_projector

    The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade , usually positioned 1000 ft (300 m) away and wherever possible set at the same level.

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