Contra Wirecutter on the IKEA air purifier (2022)

Original Article ↗ Hacker News Discussion ↗

Critiques of Wirecutter’s negative review of IKEA’s budget air purifier highlight how poorly understood air-filtration fundamentals like CADR, HEPA/EPA ratings, and real-world noise levels often are in mainstream product guides. Commenters argue that cheaper units and DIY solutions using furnace filters or computer fans can offer excellent “bang for buck,” especially when replacement filters are inexpensive, while concerns are also raised about Wirecutter’s testing rigor, affiliate-link incentives, and the polemical tone of a popular blog post debunking their recommendations. Alongside this, people share practical experiences with IKEA’s purifier line, smart integrations, and broader air-quality issues such as CO₂ buildup, VOCs, and wildfire smoke.

Overall view of the IKEA purifiers

  • Many commenters find the cheap IKEA unit very good value: low purchase price, very cheap replacement filters, solid filtration, acceptable energy use.
  • Several people bought multiple units after reading the article and report clearly improved indoor air (e.g., better allergies, less congestion, wildfire smoke mitigation).
  • Others criticize it as underpowered or insufficient for serious dust-mite allergies compared with higher-end units (e.g., Coway), especially in larger rooms or high-load environments.

Wirecutter and review-site skepticism

  • Multiple commenters say this thread confirms a broader pattern: Wirecutter reviews often seem shallow, sometimes technically wrong, and possibly biased by affiliate economics.
  • Some argue affiliate links may bias which products get tested or promoted, even if not openly “pay-to-play”; others defend Wirecutter as reasonably transparent.
  • Several generalize the criticism to most consumer-review content on the web, saying it’s now “negative value” without deep community or lab testing.

HEPA vs “true HEPA”, CADR, and standards

  • Debate over HEPA terminology: by ISO/EN definitions, H13 is HEPA and E12 is “EPA,” but “true HEPA” itself is an undefined marketing term.
  • Some point out minor factual slips in the contra article around standards; others say these don’t affect its main conclusion.
  • Strong consensus that CADR (clean air delivery rate = filter efficiency × airflow) matters more than chasing slightly higher filter classes in standalone room purifiers.
  • Several note that very high filter efficiency is less important than how quickly a device can cycle room air.

Noise, sizing, and usability

  • Noise is a major factor: if a purifier is too loud, people turn it off. IKEA models are seen as OK but not class-leading; some users find them annoying above the lowest setting.
  • Small CADR means the cheap IKEA unit may be undersized for full-room coverage at low speeds, especially for allergy targets where 4+ equivalent air changes per hour are recommended.
  • Some like audible fan noise as “white noise”; others cite concerns that noise can degrade sleep unless masking worse sounds.

DIY and hacking

  • Many advocate DIY solutions:
    • Box fan + furnace/MERV-13 filters (including Corsi–Rosenthal boxes) for very high CADR and low cost, at the expense of noise and aesthetics.
    • Custom purifiers using quiet PC fans (often Noctua/Phanteks) plus off-the-shelf filters for better acoustics.
  • IKEA filters themselves are praised as cheap, reputable, and “hackable” into other purifiers by adapting sizes with cardboard/tape.
  • Smart control: the cheaper purifier works well with smart plugs; the larger model has Zigbee integration and is popular with Home Assistant users.

Sensors, ventilation, and broader air quality issues

  • Commenters stress that particle filtration is only part of air quality:
    • CO2 sensors reveal how fast air gets stale in tight buildings, often requiring frequent window opening or mechanical ventilation (ERV/HRV).
    • VOC and PM sensors show dramatic spikes from candles, cooking, spray deodorant, ultrasonic humidifiers, and alcohol cleaning.
  • Inexpensive sensors are considered good for relative changes but often inaccurate in absolute terms; humidity also confounds readings.
  • Some note that living near busy roads or in wildfire-prone areas may require stronger or multiple purifiers and, ideally, better whole-building ventilation.

Tone of the contra article

  • The technical content is widely regarded as strong and informative.
  • The snarky/polemic tone is polarizing:
    • Some enjoy the “evidence-based snark” and see it as justified pushback against low-quality reviews.
    • Others find it aggressive, exhausting, and self-defeating, saying it distracts from the substance and feels like being yelled at over a consumer product.