Our house is a 1930s colonial block/brick house with lath and plaster walls and no insulation. On side of the house has the kitchen and dining room where we are renovating by turning it into an open layout about 17'x22' combined space. Right above that space are 2 bedrooms. The furnace is in the basement and sits under the back corner of the kitchen/dining area. The supply registers are all on the exterior wall and the return vents are on the interior walls. This was not a problem when there were lots of interior walls but those walls are now gone.
To get ducts to the second floor the ducts will need to go up to the kitchen floor joists, run between the joists to the side wall of the house, travel up through framing bays, back through 2nd floor joists and then connect to the supply register (35 feet with 4-5 90 degree turns). This is because there no where to run the supply ducts straight up unfortunately. The return ducts would have to travel through the kitchen floor and up the side wall and connect to the return duct on the side wall of the second floor. The return ducts have a shorter run and fewer turns (22 feet with 2-3 90 degree turns).
Does it make sense to swap supply and return vents so the supply runs are shorter? The return vent in the second floor is in the wall with no insulation so we'd probably go with a floor register to avoid taking the supply duct into the block wall.
We're also applying closed cell spray foam wherever we open walls however for the bays where the ducts will run, do we insulate using 1" of CC spray foam or do we use insulated ducts? Keep in mind the framing is only 3.5" deep.
To get ducts to the second floor the ducts will need to go up to the kitchen floor joists, run between the joists to the side wall of the house, travel up through framing bays, back through 2nd floor joists and then connect to the supply register (35 feet with 4-5 90 degree turns). This is because there no where to run the supply ducts straight up unfortunately. The return ducts would have to travel through the kitchen floor and up the side wall and connect to the return duct on the side wall of the second floor. The return ducts have a shorter run and fewer turns (22 feet with 2-3 90 degree turns).
Does it make sense to swap supply and return vents so the supply runs are shorter? The return vent in the second floor is in the wall with no insulation so we'd probably go with a floor register to avoid taking the supply duct into the block wall.
We're also applying closed cell spray foam wherever we open walls however for the bays where the ducts will run, do we insulate using 1" of CC spray foam or do we use insulated ducts? Keep in mind the framing is only 3.5" deep.
source https://hvac-talk.com/vbb/threads/2227126-Can-I-swap-supply-and-return-vents?goto=newpost
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