The front cover on the filterless fan has been purposely designed to - ProProfs Discuss
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The front cover on the filterless fan has been purposely designed to increase the fans performance.



A. True
B. False

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EnviroVent Filterless Extract Fan
Asked by Olivia, Last updated: Dec 18, 2019

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1 Answer

John Smith

John Smith

Answered Sep 09, 2016

True-the front grille is different in shape to any traditional fan. it has been designed to allow air to pass through it with the least amount of resistance possible. the shape of the grille is called a helical shape. as air approaches the fan it starts to swirl and ends up entering the fan in a vortex shape, similar to a whirlpool in a bathtub when the plug is removed. the front grille is shaped like this vortex to increase performance and reduce air flow noise. inside the front grille is a hall effect magnet. this magnet is an added safety feature so if anyone tries removing the grille while the fan is operating the impellor will automatically stop. inside the cover is a small divot, this can be drilled out and the pull cord string threaded through, re-positioning the pull cord when ceiling mounting the fan.
 

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