I'm in the last stages before submitting for permit for a basement renovation for my house. I'm a commercial architect (boo, hiss) and I'm doing the drawings for the project.
This is a basement renovation, no added square footage. Exterior walls are being insulated to minimum R-15 (thanks IECC!). The existing main supply duct has dampers on every duct take off. Main level is ~1400 SF, AHU is Carrier 58MVC that puts out 1400CFM.
Supply Air: I'm closing up two grilles that are cut into the main supply duct and relocating them. Then I'm cutting into a 8"x4" duct serving a very small bathroom (30-40 SF) to add some more CFM's to the den area, as this duct is generally dampered down as it is too much for that tiny bathroom.
Return Air: Air transfer ducts in the doors at Laundry and Utility room, and then a large return grille cut into the main return duct. Bathroom door will be undercut to provide air for the new exhaust fan.
What I'm trying to figure out is how to properly size the return air grilles, as well as the supply registers I'm adding. I've been leaning on some of the MEP consultants for design help here and there to fill in gaps in my knowledge that are outside my area of expertise.
My mechanical engineer buddy wants to basically do full light and ventilation schedules for the basement AND first floor in order to give me what I need for the basement. He's solving the problem the way he knows how to solve it, but for an leaky 1957 double wythe brick home it seems overkill to me. I am having my HVAC contractor come out to give me his opinion, but I wanted to see if there was a consensus on /r/hvac.
TL;DR Look at plan, read notes on plan, help me size stuff. Please.
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