Sometimes a inline adjustment is put in the duct to balance the upper and lower floor air output. You should see a handle and can rotate a door(you can not see) inside the duct. Also it could be upper floor is too far away to reach for the duct, so it is weak.
【在 g*****9 的大作中提到】 : Sometimes a inline adjustment is put in the duct to balance the upper and : lower floor air output. You should see a handle and can rotate a door(you : can not see) inside the duct. : Also it could be upper floor is too far away to reach for the duct, so it is weak.
g*9
6 楼
Possible but unlikely, look at the duct near the ac unit, you can usually see a handle or two in the middle of a duct, try to turn that slowly and someone else feel the air at the vent. (turn slowly, it could take a few seconds to the vent to change) You can partially close the one that is very strong, it will help send more to the other vent 2楼只高3米顶多 Power of the fan, newer unit have multiple speed. I program my HVAC unit such as, after temp drop to 1 degree below set, turn on unit at lowest B
【在 g*****9 的大作中提到】 : : Possible but unlikely, look at the duct near the ac unit, you can usually : see a handle or two in the middle of a duct, try to turn that slowly and : someone else feel the air at the vent. (turn slowly, it could take a few : seconds to the vent to change) : You can partially close the one that is very strong, it will help send more : to the other vent : 2楼只高3米顶多 : Power of the fan, newer unit have multiple speed. I program my HVAC unit : such as, after temp drop to 1 degree below set, turn on unit at lowest B
g*9
8 楼
If that is case, the vents could be blocked (like a kids toy). Heat rise up, so you should not have much problem in heating season. What kind of duct to you have? metal or insulated flex pipe? It is possible to put in a inline booster (basically a fan) to help your second floor situation.
I believe the duct is squre shape metal. Is it better than insulated flex pipe? Thanks.
【在 g*****9 的大作中提到】 : If that is case, the vents could be blocked (like a kids toy). : Heat rise up, so you should not have much problem in heating season. : What kind of duct to you have? metal or insulated flex pipe? : It is possible to put in a inline booster (basically a fan) to help your : second floor situation.
g*9
10 楼
The pressure loss through flex is higher than for most other types of ducts. As such, designers and installers attempt to keep their installed lengths ( runs) short, e.g., less than 15 feet or so, and to minimize turns. Keep looking for the VOCs (Volume Control Dampers) first, I do not believe you have automatic zone dampers in your house, but I could be wrong, they do fail sometime (stuck in one position) If all your upstairs vents are low in air volume, check the second floor plenums first (mo
【在 c*********o 的大作中提到】 : I believe the duct is squre shape metal. Is it better than insulated flex : pipe? : Thanks.
【在 g*****9 的大作中提到】 : The pressure loss through flex is higher than for most other types of ducts. : As such, designers and installers attempt to keep their installed lengths ( : runs) short, e.g., less than 15 feet or so, and to minimize turns. : Keep looking for the VOCs (Volume Control Dampers) first, I do not believe : you have automatic zone dampers in your house, but I could be wrong, they do : fail sometime (stuck in one position) : If all your upstairs vents are low in air volume, check the second floor : plenums first (mo