Ease Room Air Purifier

Details

An air purifier judged on the one figure that decides everything, and a page that shows the arithmetic instead of asserting a room size. Clean air delivery rate is litres of genuinely clean air per unit time, and coverage is derived from it, never measured directly. The derivation needs two things the category never prints: a ceiling height and an air change rate. An Indian flat has a ten foot ceiling, so a square foot of floor is 0.283 cubic metres of room. At two air changes an hour, 250 cubic metres an hour clears 441 square feet, and we label that variant 400, rounded down, because the industry rounds up. But two changes an hour is a convention, not a target. At five changes an hour, which is the rate that actually holds PM2.5 down in a Delhi November, the same machine covers 176 square feet. Both figures are on this page and the second one is the one to buy on. The second trick in this category is pairing numbers that never happen together. CADR is measured at the top fan setting and the decibel figure on the box is the sleep setting, and no machine does both at once. So here are the pairs. On turbo the 400 sq ft variant delivers 250 cubic metres an hour, at 52 dB(A) and 45 watts. On sleep it delivers about 60 cubic metres an hour, at 22 dB(A) and 8 watts. Sixty an hour will not clear a bedroom that is already bad; it holds a room that is already clean. If you want the room cleaned, you run it loud for half an hour first, and nobody selling you a purifier will tell you that.

• CADR to AHAM AC-1 for smoke, published in both units: 250 m3 an hour (147 cfm), 400 (235 cfm) and 600 (353 cfm) across the three variants
• Coverage derived and printed twice for each variant. At two air changes an hour with a ten foot ceiling: 441, 706 and 1,059 sq ft, labelled 400, 650 and 1,000. At five air changes an hour: 176, 282 and 424 sq ft
• H13 to EN 1822, at least 99.95 percent efficient at the most penetrating particle size, which is the 0.1 to 0.3 micron band. HEPA-type, HEPA-like and H11 grade are not H13. A filter described without a class letter and a percentage is not making a claim at all
• The activated carbon is 900 grams of granular media in its own cassette, separate from the H13, and that separation is the whole design decision. Carbon saturates on smells long before a HEPA loads on particles, so combining them into one filter, which almost every machine does, makes you throw away a perfectly good HEPA in order to get fresh carbon. Two cassettes cost more to tool and they halve what you replace
• No ioniser, no plasma, no UV in the air path. All three can produce ozone, ozone is a lung irritant, and a purifier that adds a pollutant in order to remove one is not a purifier. Ozone emission is measured and reported below the detection limit of the method, which is a test result rather than an absence of mention
• Washable metal pre-filter that rinses under a tap, so the coarse dust and the hair never reach the expensive filter
• Laser particle sensor showing a number rather than a colour ring, with its tolerance stated: about plus or minus 10 percent above 50 micrograms per cubic metre and worse below that. It also drifts, so the optical path needs a dry cotton bud every three months. A sensor nobody cleans is decoration
• Filters cost what they cost, and this is the running figure nobody prints: the H13 is Rs 1,450 and lasts 12 to 18 months, the carbon cassette is Rs 690 and lasts 6 to 9 months, the metal pre-filter is free forever. That is about Rs 2,300 a year in Delhi-grade air and about Rs 1,900 in a cleaner city. Life is tracked by run hours rather than by a calendar, and there is no chip in the filter to stop you fitting somebody else
• BLDC fan motor, 2 years comprehensive on the appliance and 5 years separately on the motor. Two promises, written as two
• Spares are held 7 years, made real by a spares bank bought with the first production run and tooling held in our name, and the motor, the sensor, the control board and the filter seals are all stocked parts
• There is no Shuunnya service network. No engineers, no city count, no turnaround promise, because we have not built one and printing one would be the same lie this page spends its length refusing. Until a service route reaches your district a comprehensive claim is settled by replacement or refund
• Installation is nothing. It plugs into a 6 A socket, and it wants 300 mm of clear space in front of the outlet and 150 mm at the back, because a purifier pushed flat against a wall recirculates its own clean air