HEPA purifiers: the CADR math
A HEPA filter is the most effective single intervention for indoor particulates. Sizing it correctly is the part most people get wrong.
Articles tagged "Interventions"
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The Corsi-Rosenthal box-fan filter
A $50 box fan, four MERV-13 furnace filters, and twenty minutes of construction. CADR comparable to a $400 commercial unit.
HVAC MERV ratings: what your furnace filter actually does
MERV 8 catches dust. MERV 13 catches viruses. MERV 16 catches almost everything HEPA does. Most homes ship with MERV 6.
Range-hood venting: the single biggest cooking intervention
A properly vented hood at high speed captures 70-95% of cooktop emissions. A recirculating hood captures almost nothing.
A renter's guide to indoor air
You can't replace the HVAC, but you can do most of what matters. Eight interventions that need no landlord permission.
What to do when PM is rising
A decision tree. Start with the source, end with the intervention. Each branch has a different right answer.
What to do when COâ‚‚ stays high
Sustained COâ‚‚ above 1,000 ppm means ventilation is not keeping up with occupancy. Four diagnostic paths.
What to do when VOC won't stabilize
Elevated VOC index for days or weeks. Five possible explanations, each with a different response.
What to do when humidity is stuck
Indoor humidity outside the 30-50% comfort and mold-safety range. Four diagnostic paths.
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Six sensors. Twelve signals.
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- COâ‚‚
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- PM1
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- Temperature
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Included
- In the box: the sensor, USB-C cable, power adapter, and printed field guide
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Works with
- Home Assistant
- MQTT
Home Assistant
MQTT