I have forced air at my home and air ducts run pretty much straight. However I want to add bathroom in the basement and because of low ceiling hight, the main air conditioning duct has to be re-routed around the bathroom (9 * 7 ft) as shown in the diagram below.
| | |<<<<<<<<<<< | ^ | ^ | ^ |>>>>>>>>>>> | | | [furnace]
As can be seen, it introduces 4 right angles. Will this significantly effect efficiency of the air conditioning and air flow?
Should I avoid re-routing this main duct?
Alternatively my other option is to make bathroom in another place in basement where location is somewhat less ideal and sewer lines are quite far away but it will not interfere with the air ducts.