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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)

   A ceiling fan is a fan suspended from the ceiling of a room. Most ceiling fans rotate at relatively low speeds and do not have blade guards because they are inaccessible and unwieldy. Ceiling fans are used in both residential and industrial/commercial settings.

4. Ceanothus prostratus - Wikipedia

   en.wikipedia.org/wiki/Ceanothus_prostratus

   Ceanothus prostratus is a decumbent (or "mat-forming") shrub, generally less than 0.3 metres (1 foot) tall [1] and spreading laterally to up to 3 metres (10 feet). [4] Its evergreen leaves are oppositely arranged and generally oval in shape with 3–9 sharp teeth along the margins.