Diagnosing furnace "gusting"


Old 01-08-19, 03:16 PM
Thread Starter
Join Date: Jan 2019
Location: Canada
Posts: 2
Diagnosing furnace "gusting"

We have a Nortron electric furnace, and since about a week, we've noticed that every 10-30 seconds while running normally with consistent airflow, it will "gust" a few times.. as in like a 'whoosh, whoosh, whoosh', then goes back to normal consistent airflow. We can notice this from upstairs just through the vents. The filter is clean and new and of same brand we've always used.

Any ideas?
Sponsored Links
Old 01-08-19, 04:15 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 50,673
Likes Received: 113
Welcome to the forums.

Any ideas?
Absolutely none. If you're sure the blower is not changing speed then I have no idea what could make a noise like that. Do you hear that noise at the furnace ?
Old 01-08-19, 07:11 PM
Thread Starter
Join Date: Jan 2019
Location: Canada
Posts: 2
ya we do.. Thanks for thinking on it, anyway lol
Old 01-09-19, 01:49 AM
Join Date: Oct 2015
Location: Ct.,USA
Posts: 1,006
Likes Received: 13
Could be your ducting is vibrating between loosened anchors or the blower has become unbalanced.You can touch either and feel vibration if its there.
Old 01-09-19, 03:06 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,905
Likes Received: 3
That "gusting" sound could be from a restricted return or supply duct or dirt caked squirrel cage fan blades that would be causing the fan to cavitate.

Opening the blower cabinet door while running would check for a change in return air restriction.
Removing a couple of supply ducts at the furnace would test the restricted air theory.
Checking for dirty blades is obvious.
One other thing is that most furnace fan units maximum speed is around 1100 rpm........perhaps the fan motor was replaced with a 1725 rpm motor by mistake.

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