Ease Bedroom Air Purifier, Compact

Details

A compact purifier for one bedroom, and a page that keeps it to one bedroom. The arithmetic is the same as its larger sibling and it is worth doing in front of you, because a compact purifier is where coverage claims get most inflated. A square foot of floor under a ten foot Indian ceiling is 0.283 cubic metres. At two air changes an hour, 145 cubic metres an hour clears 256 square feet and 180 clears 318, so the two variants are labelled 250 and 300, rounded down. At five air changes an hour, which is what actually holds PM2.5 down through a winter night, the same two machines cover 102 and 127 square feet. That is a bedroom. It is not a hall, a shop, or the 500 square feet the box on the next shelf will claim off the same number. The other thing worth saying plainly is that the small machine is not the cheap machine. Its filters cost less per change and change just as often, so per cubic metre of air actually cleaned it runs dearer than the room unit: about Rs 10.10 a year for each cubic metre an hour of CADR against about Rs 9.06. If the room is over 150 square feet, the bigger machine is cheaper to own as well as better.

• CADR to AHAM AC-1 for smoke, in both units: 145 m3 an hour (85 cfm) and 180 m3 an hour (106 cfm)
• Coverage derived and printed twice. At two air changes an hour with a ten foot ceiling: 256 and 318 sq ft, labelled 250 and 300. At five air changes an hour: 102 and 127 sq ft
• H13 to EN 1822, at least 99.95 percent at the most penetrating particle size, 0.1 to 0.3 micron. Not HEPA-type, not HEPA-like, not H11 grade, all of which are different things sold with the same word
• 350 grams of granular activated carbon in a cassette of its own, separate from the H13, so a saturated carbon does not take a good particle filter to the bin with it
• No ioniser, no plasma and no UV in the air path, because each of the three can generate ozone and ozone is a lung irritant. Ozone emission is measured and reported below the detection limit of the method
• Built quiet first: 18 dB(A) on sleep at one metre, below the background of most bedrooms, at 5 watts, and 44 and 46 dB(A) on turbo at 28 and 34 watts. As on any purifier the CADR figure belongs to turbo and the sleep decibel belongs to sleep, and the two never happen at once
• The display dims fully off rather than to a dim glow, so nothing is lit at two in the morning
• Laser particle sensor with a numeric reading and its tolerance stated: about plus or minus 10 percent above 50 micrograms per cubic metre, worse below. Clean the optical path every three months or the number stops meaning anything
• Filters: the H13 is Rs 990 and lasts 12 to 18 months, the carbon cassette is Rs 420 and lasts 6 to 9 months, and the metal pre-filter washes under a tap for nothing. About Rs 1,450 a year, tracked by run hours, with no chip in the cartridge to block a third party
• BLDC fan motor, 2 years comprehensive on the appliance and 5 years separately on the motor
• Spares are held 7 years, resting on a spares bank bought with the first production run and tooling held in our name rather than on the maker still being interested in the model
• There is no Shuunnya service network. No engineers, no cities, no turnaround promise. A comprehensive claim today is settled by replacement or refund and not by a visit, and we would rather write that down than print a map
• Installation is nothing at all. A 6 A socket, and 200 mm of clear space in front of the outlet, because a purifier on a crowded side table breathes its own exhaust