15
Maintenance
Filter Replacement
The DT-FP unit includes a pre-filter to remove large particles from the air stream. This prevents the
buildup of debris on the catalyst panel. The pre-filter should be replaced when it has become built up
with dirt and other contaminants. The manufacturer recommends replacing
filter with a 20” x 22” x 4”
MERV 13 after 3 months of continuous use.
Figure 5
Figure 6
Filter Replacement Procedure
1.) Open return filter grille. See Figure 5.
2.) Remove old air filter. See Figure 6.
3.) Inspect the new filter to ensure that it is the same size as the old filter
(20” x 20” x 4”).
4.) Insert new air filter. Ensure that arrows on filter match the direction of air flow. See Figure 6.
5.) Close return filter grille.
Direction of Air Flow