hongkongfooey;
Thanks for the info. It looks as if the IQ150 will have to be left running 24/7 and hope for the best. It will be interesting to see how long before the filters change colour.
I had a look at the Hedley Enviromental Index figures and they certainly make sombre reading. Appreciate all the past good gen you have posted on this subject. Regards,
Prince of Dzun.