DIY Air Purifier with Box Fan & 3M Filter

Build a do-it-yourself air purifier for about $25

FilterAfan

filterAfan_overview

Box fan air cleaner test

How to Make a Dust Collector for Less Than $20

DIY Home Air Purifier - Using a Box Fan

DIY Air Filtration System! - Homemade Air Purifier - Simple "box fan" c...

MAKE YOUR OWN AIR FILTER

Workshop air cleaner build

Workshop air cleaner

Workshop Air Cleaner / Pleated Dust Filter / Activated Carbon VOC Scrubb...

Miran SapphIRe XL Ambient Air Analyzer

Checking HVAC filter pressure drop

Flow Right™ Filter Box - Static Pressure Test

Measuring Fan External Pressure

Diffuser Air Flow

Duct Traverse

Performing a Duct Traverse

皮托管测量风速和风量的原理和方法