buy as a gift so that recipient can handle the guarantee?

Hello, the warranty does transfer with the product so it will be fully within warranty.

How effective is this on the smell of smoking in a home. Just moved and the previous owners were both smokers the whole house is really bad.

Can’t comment as we are non smokers in our home,it is a great machine it clears cooking smells very quickly so would think it would clear tobacco smoke

how quickly does it change the air in a 20sqm room?

Hello, Air Changes Per Hour (SCH) can only be calculated using the cubic dimensions of a space. Assuming your 20m2 room is 2.5m high, then the Alto four will change the air approx 4.2 times per hour.

Can I leave it switched on all the time?

I believe so, alternatively you can set the timer for it to run for a period of 1hr, 4hr, or 8hr. I find it works adequately to run for a short period of time in a closed room (that is windows and doors closed) without the need to have it running continuously.

Brand	EVA Air Purifier
Model Number	Alto four
Colour	White
Product Dimensions	34.7 x 17.5 x 53.5 cm; 5.6 kg
Power / Wattage	34 watts
Voltage	240 Volts (AC)
Material	Eva
Auto Shutoff	Yes
Noise Level	17 dB
Special Features	Child Lock, Professional-Grade PM2.5 Particulate Sensor, Replace Filter Indicator, Light Sensor, Timer Function, Includes a Two Year Filter Supply
Item Weight	5.6 kg

Alto four

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