12" (315 / 1000) 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 / 1000) Replacement filter Sleeve contains:

1 x 12" (315 / 1000) Replacement filter Sleeve