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Air purifiers, explained.
CADR is three numbers measured under ANSI/AHAM AC-1, and the sizing rule is two-thirds of the room's area — 80 cfm of smoke CADR for 120 square feet.
Dehumidifiers, explained.
The pint rating is measured at 65 °F and 60 percent humidity; a machine once sold as 70 pints now reads 40 to 45. ENERGY STAR V6.0 sets the L/kWh floor.
Drinking-water filters, explained.
Lead reduction means an NSF/ANSI 53 claim tested from 150 ppb down to 5 ppb or less — ten times the EPA's 15 ppb action level. Stages count for nothing.
Ergonomic office chairs, explained.
ANSI/BIFMA X5.1 tests chairs to a 253-pound occupant and X5.11 to 400 pounds with a 22-inch seat. Neither says the chair fits you: ranges do.
Heat-pump dryers, explained.
ENERGY STAR asks 2.68 lb/kWh of a ventless compact 240V dryer and 3.93 of a standard electric, but the test loads differ: 3 pounds against 8.45.
Robot vacuums, explained.
No standard measures suction in pascals: IEC/ASTM 62885-7:2020 measures dust and fiber removal instead. Read the bin, the bag and the parts prices.
Video doorbells, explained.
The subscription outweighs the hardware: $100 or $200 a year, and 24-hour recording needs a wired unit on a 16–24 VAC, 10–40 VA transformer.