When we buy new device such as Holmes HAP424-U we often through away most of the documentation but the warranty.
Very often issues with Holmes HAP424-U begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Air Cleaner Holmes HAP424-U is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Air Cleaner on our side using links below.