AIR
How to Test Your Tap Water at Home
The short answer There are three levels of water testing, and they answer different questions. Level Cost Answers Does not answer Read…
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Guides, reviews & news
Everything we have tested and learned about cleaner air and safer water.
AIR
Coverage Area Claims: Why “Up to 1,000 sq ft” Misleads
The short answer A coverage area claim is not a measurement. It is a calculation, and the manufacturer chooses the inputs. The…
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AIR
How Much Electricity Does an Air Purifier Use?
The short answer Most home air purifiers draw between 4 and 20 watts on the low and medium speeds people actually use,…
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AIR
Air Purifier Noise Levels: Decibels Explained
The short answer A good air purifier runs at roughly 24 to 40 dB on its lowest speed and 50 to 68…
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AIR
MERV vs HEPA: What Each Rating Measures and Which You Need
The short answer MERV and HEPA are not two points on the same scale. They are two different standards, written for two…
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AIR
Air Purifier Certifications: AHAM Verifide, CARB, Energy Star
The short answer Four seals are worth knowing, and they answer four different questions. Seal The question it answers Who checks AHAM…
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AIR
What Size Air Purifier Do I Need? A Step-by-Step Calculator
The short answer Multiply your room’s floor area in square feet by 0.67. That is the minimum smoke CADR you need, from…
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AIR
Air Changes Per Hour (ACH): What It Means and How to Calculate It
The short answer Air changes per hour (ACH) is how many times per hour an air purifier processes a volume of air…
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AIR
CADR Explained: What CADR Rating Do You Actually Need?
The short answer CADR stands for Clean Air Delivery Rate. It is the volume of perfectly clean air an air purifier delivers…
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AIR
Air Purifier vs HVAC Filter: Do You Need Both?
This question usually arrives with a note of irritation. You already have a central heating and cooling system. It already has a…
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