Complete DIY Air Purifier Guide for UK Homes

Building your own air purifier is an affordable way to achieve professional-grade air filtration. This guide walks through creating a quiet, effective HEPA air purifier for below £250.

Why DIY Air Purification?

Commercial air purifiers often cost £300-500, while DIY builds using the same HEPA filters cost below £250. You get equivalent performance at a fraction of the price.

Materials Needed

• 20" box fan (quiet model): £25-35
• 20"x20" HEPA H13 filter: £30-40
• Duct tape or filter adapter: £5
• Optional pre-filter: £5-10

Assembly Steps

1. Ensure fan is unplugged
2. Attach HEPA filter to fan intake using tape/adapter
3. Create airtight seal around edges
4. Position with filter facing room
5. Test on low setting first

Performance

A well-built DIY unit achieves 280-320 m³/h CADR on high speed, enough for 6+ ACH in a 48m³ room. Noise levels: 35-42 dB depending on fan speed.

Maintenance

Replace HEPA filter every 6-12 months depending on usage. Pre-filters extend HEPA life and should be changed monthly.