Duct Booster Fan
#1
06-26-22, 07:28 PM
Duct Booster Fan
I'm normaly not a fan (no pun intended) of things like this, but I think I have a situation where this might be required and necessary.
The short version is that we have retrofitted central AC into a house that was built in the late 1800's. As such, one room had no AC register due to structural limitations. The warm room got to be a troublesome issue for me, so we tapped off the bathroom duct, went between the second floor joists and got a box and register installed.
The issue is that the feed from the AC unit is a 9" duct that we 'wyed' off of and then had to go down to a 5" duct to get to the bedroom another 4' away with a register boot fished between the floor. When we did this, we essentially get the bathroom air in the bedroom. This was expected and acceptable. But, that air for a bathroom is plenty, for a bedroom, not so much.
However, we cannot put a bigger duct or register in, it's not possible. Everything is duct tied and sealed with mastic, so all available air is coming out. So, I was wondering if a 9" duct booster fan in the supply duct for that room might address the problem?
Is this a suitable application?
The short version is that we have retrofitted central AC into a house that was built in the late 1800's. As such, one room had no AC register due to structural limitations. The warm room got to be a troublesome issue for me, so we tapped off the bathroom duct, went between the second floor joists and got a box and register installed.
The issue is that the feed from the AC unit is a 9" duct that we 'wyed' off of and then had to go down to a 5" duct to get to the bedroom another 4' away with a register boot fished between the floor. When we did this, we essentially get the bathroom air in the bedroom. This was expected and acceptable. But, that air for a bathroom is plenty, for a bedroom, not so much.
However, we cannot put a bigger duct or register in, it's not possible. Everything is duct tied and sealed with mastic, so all available air is coming out. So, I was wondering if a 9" duct booster fan in the supply duct for that room might address the problem?
Is this a suitable application?
#2
06-26-22, 09:33 PM
Group Moderator
#3
06-28-22, 12:40 PM
The ones I saw say they just plug in to a 110 receptable. That's all fine, but how do they work? Do they have a paddle sensor or something to recognize when the air is flowing so they come on when needed or do they just stay on all the time?
Based on my 'back of the hand o'meter', I don't need that much more air. I'm almost there.
Based on my 'back of the hand o'meter', I don't need that much more air. I'm almost there.
#4
06-28-22, 01:34 PM
Group Moderator
