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What was there to start with? Your choice how much dirt you want to catch. 4 " should do right or maybe a 4" with a 1" pre filter.
 

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Nothing wrong with a 1" pre filter if preferred. Have seen them zillions of times in all types of applications.
 

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5" will fit the tightest and have less air/dirt leakage around the filter and is propbably better value per dollar and will last longer.
 

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Why in the hell would you put a filter that lasts 1-2 months in front of a filter that last 6-12 months. What is that 1" filter going to catch that a 5" filter won't. All you are going to do is restrict airflow quicker.
 

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And I don't care how many times you've seen it. You know how times I've seen a dog piss through a condenser? Zillions. Still not going to train my dogs to do it.
 

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And I don't care how many times you've seen it. You know how times I've seen a dog piss through a condenser? Zillions. Still not going to train my dogs to do it.
"O eN iN Take a chill pill"
 
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