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What is Black Wall or Gray Wall Effect?

Black Gray wall
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What is Black Wall or Gray Wall Effect?

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Gray wall or Black wall effect is a situation where the dirt particles and black residue near the needle are electro-plated or built up to the wall. As a result, it will be hard to clean the air purifier.

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Gray Wall or Black Wall Effect occurs when electro-plated dirt particles and black residue build up on surfaces near the needles, making it hard to clean the air purifier.

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