I am getting a new forced air/natural gas system installed and I have a question about the cooling coil configuration.
I note that the aperture area at the bottom of the coil assembly is considerably smaller than the supply plenum in which it sits - maybe half the area - but 100% of the air driven by the furnace fan passes through the coil. This is a furnace with a fan that can run at up to 2,000 RPM.
Although this makes some sense to me for cooling operation, my question is whether it's also acceptable when the system is used for heating. Intuition tells me there ought to be a movable baffle to allow for bypass of the coil or even some full-time bypass going on. Right now there is maybe 25% of the area blocked off with sheet-metal.
Your advice/comments on this point would be much appreciated.