This review is for the Eureka Forbes Dr. Aeroguard SCPR 100 which is the smallest airpurifier in the range. Looks nice, fully automatic, consumes just 5W. However it is NOISY. Cannot imagine sleeping next to it. The airflow noise is completely drowned out by a whirring sound from the fan motor. In fact the unit makes more noise than my 0.5 ton AC’s indoor unit, and more noise than my PC. That should give you a feel.
If buying one, DO ask fro a demo and buy only if you are comfortable with the noise it makes.