There is no set tonnage rating for furnaces, only the ac units which are attached to them. Since furnaces with multiple blower motor speeds can accommodate several different size ac units. To get your ac units tonnage, get the model # of the outdoor unit and repost.
What is the tonnage of york a AC model CM30-6a
The AHU unit does not have a tonnage rating, since all AHU`s can accept a number of different tonnage evaporator coils. Your best bet would be to post the condensing unit model and serial#`s.
3.5
2 ton
2 ton
4tons
5 Tons
5 Tons
3.5 tons
3-Ton
3tons