HEPA Air Purifiers Are Misleading You (A Cardboard Box Does Better)

Winix says the 5510 cleans a 1,882 sq ft room in an hour. That's one pass of air, measured on a Turbo setting as loud as a dishwasher. Turned down to a noise you can live with, it delivers less than half its rated clean air, and a $146 cardboard box of furnace filters and PC fans does that same job quieter and on less power. I own four HEPA purifiers, and I still run them. This video takes the box and the listing apart: what CADR (clean air delivery rate) actually measures and why every rating is taken at top speed, what AHAM's room-size rule really means, how "Ultra-Quiet 23.5 dB" and "1,882 sq ft" come from opposite ends of the dial, and three traps to watch for when you buy: ionizer buttons, "HEPA-type" filters and inflated room sizes. Then four free fixes for the purifier you already own. 🌐 Site: https://efficienado.com 📸 Instagram:   / efficienadodotcom   ☕ Support (no sponsors, ever): https://ko-fi.com/efficienado If this saved you from paying for a number on a box, the Ko-fi keeps the channel sponsor-free. Subscribing is free, which is pretty cool, eh? #airpurifier #HEPA #DIYairpurifier #indoorairquality Timestamps: 0:00 Are HEPA air purifiers misleading? 2:01 Can a DIY box beat a HEPA purifier? 3:47 DIY box vs Winix: cost, power and noise 6:17 Does 99.99% HEPA mean clean air? 8:07 What CADR (clean air delivery rate) measures 9:46 Why every CADR is a top-speed number 10:59 How loud is a Winix 5510 on Turbo? 12:32 Two DIY builds that beat the Winix (modeled) 13:42 Is the DIY model accurate? 14:24 What "cleans 1,882 sq ft" actually means 15:43 AHAM's room-size rule and the real 392 sq ft 17:22 "Ultra-Quiet 23.5 dB" is the sleep setting 18:26 8 ft ceilings, and why to size up 19:20 The fairest comparison: CADR at a livable noise 20:38 Trap 1: the ionizer button 22:07 Trap 2: "HEPA-type" means nothing 22:59 Trap 3: divide the room size by 5 23:38 What to do with the purifier you already own