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12" (315 / 1200) Replacement filter Sleeve
The outer sleeve on a carbon filter is essentially the pre-filter. It is designed to catch larger particles in the air before they even get to the carbon filter bed. This will significantly increase the life expectancy of the filter.
12" (315 / 1200) Replacement filter Sleeve contains:
1 x 12" (315 / 1200) Replacement filter Sleeve