I measured the airflow with a turning vane at each supply duct and added them together. I have an Aprilair filtering system on the return side already. I am working on getting the model numbers off the coil and blower. It has been way too hot to go up into my attick.
Are you not getting the cooling you want? What made you check the air flow in the first place?It sounds like he put in a 3.5 air handler, if so did he charge you for a 3.5 air handler.I don't think you will get any help from Luxaire, only because it is a York product.I still think you will have to pay another contractor to fix your problem.
Post the mod number of the blower, coil, and condenser.