AG Mechanics CDE Practice Exam 2026 – The Comprehensive All-in-One Guide for Success

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Single element ________ filters should be oiled to help catch dust particles better.

Foam

Foam filters should be oiled to help catch dust particles better because foam has a porous structure that allows air to pass through while trapping small particles. However, oiling paper, metal, or plastic filters can block the pores and inhibit air flow, making them less effective at filtering dust. This is why foam filters are the only ones that should be oiled.

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Metal

Paper

Plastic

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