| The previous post is spot on and;
Some of the newer better furnaces use speed controlled fan motors, the advantages are obvious.
Isolation is the biggest issue. Round ducts as stated with as much insulation as you can. Think in terms of a port on a speaker... Use the biggest vents possible into the rooms.
The 2 keys are;
cut down on motor/fan noise and you want to ducts as smooth as possible internally to cut down on air turbulance. One trick that can be used is to add into the ducts vanes in parallel to the duct. This is to make the air flow all in one direction, kinda like columating a beam.
If you're not sure/certain then get ahold of a HVAC engineer. Not an installer. Call Trane,Carrier, whomever and ask for someone locally. There will be somebody that has done the TV stations, concert halls... in your area that will know what to do.
Be cautious, you can spend a lot of money fast on this issue so only spend what you need. Meaning, if it was me I would take one issue at a time to make certain something was an issue before spending money on it. |