Quote:
Originally posted by CptnDipshit
That is why I said to go through the filter then the radiator. if you took the biggest filter they have at the hardware store and then found a truck radiator or something as large as the filter then made a new housing between the cold air return and the furnace you wouldn't lose much if any efficientcy. You cound then go to an underground tank (Bladerunner style) using the heat for your house in the winter. You could probably bypass the radiator in the summer so as not to hurt the A/C efficientcy.
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Then we're back to "complicated"
Ideally, you'd use the same type of filter that you already use with the furnace, but you'd still have to deal with the loss of airflow because of the rad. Unless of course, the rad doesn't restrict airflow that much, but that may not be the case with a truck radiator.
Either way, what you could do, is make a new housing that has a seperate vent to allow the same airflow as the original does, to bypas the rad altogether (like you suggested, but permanently). There should still be enough suction to pull air through the rad. You really don't need a lot of airflow through a rad, for an application like this.