merv

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How to Make a DIY Air Filter | Ask This Old House

How to Make a DIY Air Filter | Ask This Old House

1.2M views • 5 years ago

This Old House's Ross Trethewey explains MERV filter ratings and how air filtration works, then shows how to build a localized DIY air filter, including a box fan with multiple filters.

Build a Do-It-Yourself Air Purifier for About $40

Build a Do-It-Yourself Air Purifier for About $40

2.3M views • 15 years ago

Michigan Medicine

A University of Michigan Medicine demonstration of building a cheap DIY air purifier from a box fan and a HEPA or high-MERV filter using hardware-store parts. It explains why this helps against dust, smoke and viruses and ties it to local air quality readings.