No recommended service interval, just "when they fail"
Monthly
How often should you change the fuel filter?
Pancake Coils are often used as evaporator and condenser coils in refrigeration systems.
as often as needed
You should change your oil every 3,000 miles. If you drive your car rough, then you should change it more often.
everyday
How often should you change water pump in a boat
Every week
You should change them after every feeding because they should be washed after every feeding.
If it cycles off and on too often, it may not provide enough dehumidification. It takes awhile for the evaporator coils inside to get cool, which is when they provide adequate dehumidification.
The average motorist should change the oil every 3000 miles. Oil should be changed more often if driven in dusty condition.
you should change it every week so it will always be clean.