union carbon postfilters Size:20" x 5" x 5 16" 500 m2 adsorption surface area) Air Exchanger Filters 918406 Size:9 3 4" x 16 1 2" x 1 3 4" Continuous fibres to avoid 500 m2 adsorption surface area) Replaces Electronic Cells in: Lennox 17 20EAC
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