I've got a 3 ton carrier 2-stage heat pump in the basement supplying the 1st story (~1300 sq/ft). I've attached an image of the current layout (top half of graphic) and proposed changes (bottom half of graphic).
I'm finishing the basement and a 4' section of trunk runs into the middle of the room. I'd like to relocate this section down the length of the wall (yellow line) in a soffit as to maximize my ceiling height. Doing this will also allow me to run my flex duct lines (all are 6") within the floor joist spaces. Effectively I'm looking at taking a 5' length of 12"x12" (OD) fiber duct trunk, shortening it to 1' and teeing it into a new 30' run of fiber duct trunk. This will obviously also affect the length of some of the flex lines that branch off of that particular trunk.
The question is how big should this longer trunk run be?
I'm finishing the basement and a 4' section of trunk runs into the middle of the room. I'd like to relocate this section down the length of the wall (yellow line) in a soffit as to maximize my ceiling height. Doing this will also allow me to run my flex duct lines (all are 6") within the floor joist spaces. Effectively I'm looking at taking a 5' length of 12"x12" (OD) fiber duct trunk, shortening it to 1' and teeing it into a new 30' run of fiber duct trunk. This will obviously also affect the length of some of the flex lines that branch off of that particular trunk.
The question is how big should this longer trunk run be?