The H101 is the replacement 1st stage, 20"
x 25" x 1" throw-away, pre-filter for
all models of Abatement Technologies, Inc.s CAP100
Central Air Purification system. The 1st stage
filter removes coarse particles from your HVAC
system.
The manufacturer recommends you change the 1st
stage filter every 1 to 3 months under normal
operating conditions.