The filter should be replaced once a year. Allergy H13 exhaust filter for excellent filtration. s-filter® is a standard exhaust filter that is widely available and carries an easily recognisable logo.
Philips NanoProtect HEPA Filter for AC4550, AC4558, AC3256, AC3259 (FY3433/10)
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Hoover HP3 HEPA Allergy & Pet Corded Bagless Cylinder Vacuum Cleaner Ex-Display
