Originally Posted by
key1cc
I'm sure it is possible but I don't think it is realistic (when a coil is involved). If the othe poster "Mchild" had a coil contibuting ~0.25, he/she also would be over the 0.5 max.
My duct work is already underway but when it started, the duct guy cut a 14x14 hole in the front of the plenum for a 14x14 additional trunk. We checked the static pressure at that point with no ductwork attached coming out of the front of the plenum (just a big hole) and a 12x9 trunk coming out the top (unchanged) and a 8x9.5 trunk coming out the back of the plenum (also unchanged). The static pressure was 0.79 (versus 1.1 when the 14x14 hole was not there). Next, we opened the filter door and the SP dropped to 0.57. So with a big 14x14" hole in the front and the filter door wide open only 0.57 was acheived. That is why I beleive the 0.5 max is unrealistic.
Key1