Anyone !!
I am trying to see if a contractor is telling me correctly.
Thanks

4 tons = 1600 cfm.
coming off return plenum( 16",1000cfm,9" 225cfm)total capacitiy 1200 cfm.flexible tubing I assume. not enough.
if all hard piped total 1450 cfm.still a little short.
you need to increase the 9" to 14"(700cfm) then 12" to living room and 8" to den. You can still use the same filter grills. this added return will lower static pressre and make for a quiter system.((more return the better.))
make shure he does a static pressure test so they dont make the mistake of leaving the fan in high speed if it is a 5 ton drive. call f you need more answers 201 983 3522.
CJ Mech

It is all hard pipe.
Thanks

normally 16" is not enough for a 4 ton system, but you have a package system which may only have a 16" return inlet at the system it's self.

Thanks Classicdave for the additional info.
I looked up the specs on the unit and the return hole on the unit is 16" wide but it doesn't give the height. So my 2 returns 16" and 9" (hard pipe) might make it afterall. I have been concerned all weekend over this. I didn't know that the split systems required more return air than the packaged units and by reading some posts I felt like I was way short. The unit has a 2 stage compressor so I knew that I was ok on 1st stage but I was concerned about 2nd stage. Thanks again !