Here is the situation. I installed a solid fuel furnace and it came with a direct drive furnace blower. I do not like the noise of the motor that is transmitted through the ductwork. Even though it is on isolators for sound.
So here is my idea. I get a belt drive blower,extend the shaft and mount the motor “outside” the ductwork. I would put a guard around the belt for safety.
So what do you think?
Also what kind of motor would I need in order to control the speed?
Thanks!
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I think you'll get as much noise, possibly more.
Motors don't make much noise ... it is the fan that makes most of the noise, I think. With the fan you have, you probably will go through a lot of effort for little gain. Is this a direct drive fan setup? That would be a bit unusual, but don't know your specifics. Most supply fans aren't designed to operate at motor speeds (e.g. 1700 rpm). That's my 2 cents.
Most residential furnace fans these days are direct drive.
The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith
Really. Didn't realize. Still say the noise isn't the motor ... it's the fan itself.
Yeah, when everything is properly balanced the bulk of the noise is from the air moving through the fan wheel. Things get the slightest bit out of balance, though, and you can get all sorts of vibrations.Direct drive are quieter because there's no belt noise and because one doesn't have the tension of the belt upsetting the balance and wearing out the bearings.
The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith
on a centripical fan. sometimes the centrifugal blades get clogged with lint causing the fan to be out of balenced and loose performance
How would I know this??????? In college, one the dirtest jobs I ever had in the maintance dept was climbing into the huge air handlers and indivually scrapping each vein. There was a ton of crud . Came out looking like a chimney cleaner.
A simple way to reduce the noise would be to Take out a section of ridgid duct and replace ti with a U bend of flex duct. The flex would have to be a larger size as it cuases more drag.
Tu stultus es
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
Look, just send me to my drawer. This whole talking-to-you thing is like double punishment.
I think the best solution is to install what is commonly called a "canvas" or flexible duct connection to isolate the "speaker" from the "reverberation chamber". Most commercial HVAC supply houses will have these and most will make a cash sale to you. Look here http://www.durodyne.com/xephr/list/DUCT_CONNECTOR for more details.