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I'm going to be installing an additional 2 ton central air and gas furnace system in my attic to go along with my other 2 ton system and creating zoned heating and cooling. I am doing all of the setup work myself and then having a professional come in and finish of with the refrigerant and that type of stuff. The unit will be cooling 2 16ft x 20ft bedrooms, a 10x10 bedroom, a 8x8 bath,,, and a hallway. I will be putting in insulated flex returns and supply . I am wondering what size flex duct I would need to use for both the return and supply runs. Any help would be appreciated
 
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