your filters are very good in cleaning the air we breath particular during the winter months if your house is airtight, yet is still good to have a window on a crack open during the night when you sleep ,oxygen is consumed by running your furnace, the more oxygen the quicker your house will warm up .
I have always used filtrate filters, they didnt seem to last very long, always had tons of dust everywhere in my house. I diffidently dont have this problem now.