Filter Everything Replacement Air Purifier Pre-Filters Compatible with Honeywell Models HPA100, 200, 300, 8350 series and Part HRF-AP1 - Dims measure 15.75 x 47.5 x 1/4 - 2 Pack (2) : Amazon.co.uk: Home & Kitchen
Fette Filter - Premium HEPA Replacement Filters Honeywell Air Purifier HPA300 with Pre-Filters Replacement HRF-AP1 (6 Hepa Filters & 8 Pre-Filters) : Amazon.co.uk: Home & Kitchen