Working on an in-law suite addition - unconditioned crawlspace placement of HVAC unit.
A few code questions/concerns:
What is the minimum R value insulation that can be used on ducts in crawlspace? Especially the return duct?
Code for R value, duct material and wrap/sealant?
What is the feedback for using building cavities as supply and return duct lines?
We are finding panned bays in this space similar to the image below and planned use of wall cavities in the main living space with NO plans for low returns…
Finally if someone can answer Y/N if the following is required in PA?
Float pan under suspended unit?
Air duct blast testing after completed install?
I appreciate all help - We are concerned that we need to go into a stop work order tomorrow if corrections are not made. Any assistance is greatly appreciated.