What is the proper sizing for a central air duct?

Answer by  Timpridemore (149)

There are formulas to determine the proper duct size for a given system and central air conditioner manufacturers usually provide general information regarding the duct size for their products.

Answer by  tungvnpt (9)

in my opinion,one the proper sizing for a central air duct mustb have dimension suitable. i don't known what is the standard of the central air duct,so i have nothing to say more than,furthermore infact i ever see a central air duct,i need to know the right sizing for my central air duct

Answer by  mike90 (71)

The size of the duct depends on the size of the central unit and the sqaure footage of the house,hire a qualified profesional for best results

Answer by  chris832 (3)

The only correct answer is do Manual J, Version 8 load calculations