60 Hz hum coming from working furnace blower

Reply

  #1  
Old 03-04-10, 07:35 AM
Member
Thread Starter
Join Date: Mar 2010
Posts: 8
Upvotes: 0
Received 0 Votes on 0 Posts
60 Hz hum coming from working furnace blower

My wife and I just bought a house that was built in 1983. It has an original Magic Chef 40,000 BTU forced air gas furnace that has a blower motor that has a 60 Hz hum when its on. The way the builder constructed the enclosure of the heater seems to amplify the hum - its like a piano sound board. If I press on certain parts of the drywall around the heater, the humming gets louder. The furnace enclosure is in our living room, so its pretty annoying. Everything works fine on the furnace. How can I reduce or eliminate the hum? Do I need to buy a new blower motor? Is there any sound dampening material I can install to reduce the noise?

thanks
 
Sponsored Links
  #2  
Old 03-11-10, 12:15 AM
Member
Join Date: Mar 2010
Location: Silicon valley, USA
Posts: 10
Upvotes: 0
Received 0 Votes on 0 Posts
Originally Posted by electricguy482 View Post
My wife and I just bought a house that was built in 1983.
I think you first need to determine major part of the sound, may be one or two pieces metal sheet vibrate and you need to tighten them. If it is due to weak or wrong construction, you can add enhance its structure by screws metal or wood (not in hot area of course) to reduce the sound.
after all, it may also come from unbalanced feet, and you can adjust or add rubber pads under them - HD sells thick pads at washer dept.
If it touches walls you need to move it a bit.
 
  #3  
Old 03-16-10, 03:57 PM
Member
Thread Starter
Join Date: Mar 2010
Posts: 8
Upvotes: 0
Received 0 Votes on 0 Posts
Good ideas...i especially like the one about the rubber pad. The entire furnace appears to be bolted to a raised plywood 'floor'. If I put a rubber pad between the furnace and the floor, I'll bet a lot of my noise will go away. I'll post again when i get a chance to do this. Thanks again.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: