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20
®
External Filter Maintenance
Aluminum mesh, 2-inch deep filters are located in the
supply weatherhood (if the weatherhood option was
purchased). Filters should be checked and cleaned on
a regular basis for best efficiency. The frequency of
cleaning depends upon the cleanliness of the incoming
air. These filters should be cleaned prior to start-up.
To access these filters, remove bottom bolt in the
access door on the side of the weatherhood (one
access door on each side of weatherhood). Slide the
access door up and then pull bottom out to remove
door. Then, slide the filters out (see FIGURE 23).
Clean filters by rinsing with a mild detergent in warm
water. After the filters are dry, an adhesive spray,
available at most filter distributors, may be applied to
increase filter efficiency.
Internal Filter Maintenance
The APEX will typically be provided with 2-inch, pleated
filters in the outdoor air and exhaust airstreams. These
filters should be checked per a routine maintenance
schedule and replaced as necessary to ensure proper
airflow through the unit. See TABLE 4 for pleated filter
size and quantity for each unit.
Outdoor Air Filters: Access to the outdoor air filters is
through the doors labeled as “Filter Access” (both
sides of unit). The filters are stacked two high and four
deep. They can be removed by pulling on the strap
mechanism (see FIGURE 24). Be sure to replace strap
mechanism to assist with filter replacement for next
maintenance interval.
Exhaust Air Filters: Access to the exhaust filters is
through the door labeled “Coil Access”. You must enter
the unit to get at the exhaust filter access door. This
door is located in the divider between the airstreams
(see FIGURE 25). Open the door and pull the exhaust
filters up and out of the “V” bank rack.
Door Seal Maintenance
Slip-on type vinyl seal is installed on the perimeter of
the door openings of the APEX. Seal should be
inspected at least annually to ensure that seal is still
pliable and intact.
FIGURE 23:
Outdoor air
intake hood
mesh filter
access.
Internal Quantity Quantity
Model
Filter Size Supply Exhaust
APEX-200 20 in. x 20 in. 16 16
TABLE 4: Filter size and quantities.
Routine Maintenance
FIGURE 24: Strap mechanism used to
remove outdoor air filters.
FIGURE 25: Access to exhaust air filters.