It is a 3.5 ton air handler and without knowing for sure about Rudd only making those sizes which they should, they more than likely would have gone up to a 4ton coil. One way to cross check this, is to see what ton the condenser outside says it is. If you have a 4ton condenser, then you should have a 3.5 to 4 ton coil, either being okay. What you don't want, is a 3 ton coil and a 4 ton condenser and so on. A half ton isn't going to be a problem regardless, but if anything, you can always take the measurements of the coil if you are trying to replace it.
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4 ton with piston chage on some
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