Short answer
Mites cannot be seen; they live in beds, carpets and upholstery and feed on shed human skin and dust. The window is one of the main ways dust gets into the home. That is why reducing dust from the window is part of tackling dust allergy.
Is the window enough on its own?
No. Mites multiply inside the home; a window filter does not kill mites. Its contribution is to reduce the dust load coming in from outside. Dust allergy and mites – we cover this topic in detail on that page.
Made to measure: hook-and-loop or roll

