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After determining the manner or type of dehumidification system configuration that will be used, and if the duct system equivalent
length is acceptable, please use the following criteria and guidelines for installing the ductwork.
Under normal circumstances, the air filter in the dehumidifier should be cleaned or replaced once a year. A clean filter is necessary to
prevent damage to the dehumidifier and to allow the dehumidifier to function at full capacity. To remove the filter, first unplug or
disconnect power to the dehumidifier, then remove the air filter via the filter access panel on the side of the dehumidifier. To clean,
flush with warm water and detergent solution. After a clean or new filter (Model 4510) is reinstalled, replace the access panel and
reconnect power to the dehumidifier.
• If needed, use Aprilaire
®
Normally-Closed Damper Model
6508 on the dehumidifier outlet. The recommended location
for this damper is at least 3 feet downstream of the outlet
collar. Do not use conventional back draft dampers, the
pressure drop of these dampers is too high.
• The outlet from the dehumidifier to the HVAC supply duct
must be located at least 6” downstream of the cooling coil.
• If the dehumidifier inlet is drawing air from the HVAC return
duct, it must be located at least 6” upstream of the HVAC
system air cleaner. This will prevent any trapped particulates
from being drawn into the dehumidifier.
• If UV Germicidal lamps are installed in the HVAC System,
use appropriate methods to protect the flexible duct from the
UV light.
• At the time of install with a new air filter, the airflow
rate through the dehumidifier must exceed 210 cfm.
If it does not the dehumidifier must not be installed.
• If air noise is a problem, install at least 5 feet of acoustical
flexible duct on the outlet of the dehumidifier.
• If inlet or exhaust grilles are used they must be properly sized
so as not to restrict airflow. They should be sized for an
airflow rate of 275 cfm.
• If a ventilation duct is used, locate the ventilation air
inlet at least 3’ upstream from the duct that feeds the
dehumidifier inlet.
• The blower in the dehumidifier has a shutoff pressure of
1.2“ w.c. Therefore, with added safety factor ductwork must
be able to withstand pressure of 2” w.c.
• If tees are used in the ductwork, install them in such a
manner that reduces system pressure drop.
AIR FILTER