Ditto on the question about whether this is about rigging up an "add-on" filter or some sort of factory filter. I have a 05 DC Limited, and it does not appear that I have one, nor do I see a filter listed anywhere as an option. It's not in the owners manual either.
Is there a simple and effective way to rig one up ourselves? Many thanks if someone has done this and can give us an idea on what to do.
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