Have 2 6" runs coming off the main trunk feeding the end room The left on comes off the trunk, goes about 8 ' or so then does a 90degree bend down, then another 90 degree bend across the length of the room (about 12 ') . Then this goes into a 45 degree or so into a wired aluminum duct to fit between joists and attaches into a 4x10" output.
The other side of the room goes about 7' off the main trunk and then there are 2 90degree turns and this runs directly into the 4x10 supply.
Am I losing that much air flow? Have tech coming out tomorrow to replace defective Infinity Thermostat.
p.s. would it be worth trying to make all the 90's into 45's??????