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Old 01-26-2011, 04:30 PM   #1
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My furnace has a slight vibration when the inducer motor kicks on that radiates into the framing of the house. It's not bad, but I would prefer it not be there. Could I use one of these in the return plenum near the furnace?


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Old 01-26-2011, 04:42 PM   #2
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Yes, most well installed HVAC systems will have one on the supply duct and the return duct.

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Old 01-26-2011, 05:33 PM   #3
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Yes, most well installed HVAC systems will have one on the supply duct and the return duct.
I don't know about well installed! Those things leak and look horrible! A good installation wouldn't need that and instead be transitioned in the field with sheet metal. The inducer should not be vibrating, especially the whole furnace, to the point you hear it through the house.
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Old 01-27-2011, 05:59 AM   #4
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hvactech126 You are totally wrong in your answer.

They are designed to stop vibration not look pretty.

Last edited by COLDIRON; 01-27-2011 at 11:11 AM. Reason: Changed answer
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Old 01-27-2011, 04:26 PM   #5
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a correctly installed and maintained furnace wont vibrate
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Old 01-27-2011, 04:35 PM   #6
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Hummm.... now it may make better sense to find out why the vibration is there. Probably no more costly and most likely less work. Thanks for the wake up.
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Old 01-27-2011, 04:39 PM   #7
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Question, Why did they invent canvas connectors??

Answer, to stop unnecessary Harmonic distortion from ductwork to the entire house.

FYI: Vibration eliminators on all large/small piping systems, ductwork, bridges, buildings.

Signed 40 Year HVAC Mechanic

PS: By the way canvas connectors are the proper term of what was shown in the picture if you didn't KNOW.
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Old 01-27-2011, 09:29 PM   #8
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Thanks COLDIRON. I didn't know the correct term.
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Old 01-28-2011, 04:27 AM   #9
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Originally Posted by hvactech126 View Post
I don't know about well installed! Those things leak and look horrible! A good installation wouldn't need that and instead be transitioned in the field with sheet metal. The inducer should not be vibrating, especially the whole furnace, to the point you hear it through the house.
A flex/anti vibration connecter is actually required by code on sheet metal duct systems.
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Old 01-28-2011, 05:49 AM   #10
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A flex/anti vibration connecter is actually required by code on sheet metal duct systems.
"Thank You very much beenthere"
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Old 01-28-2011, 06:19 AM   #11
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A flex/anti vibration connecter is actually required by code on sheet metal duct systems.
In your area, not here
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Old 01-29-2011, 06:24 AM   #12
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In your area, not here
Then your area isn't following/enforcing them IMC. International Mechanical Code.
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Old 01-29-2011, 09:07 AM   #13
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Then your area isn't following/enforcing them IMC. International Mechanical Code.
I'm assuming you are talking about section 603.6 NO where in this section discussing Flexible air ducts and flexible air connectors does it say they HAVE to be used.

otherwise section 301.10 Vibration isolation
Where vibration isolation of equipment and appliances is employed, an approved means of supplemental restraint shall be used to accomplish the support and restraint.

again nothing stating you HAVE to use a flex air connector

please if you have the specific section that says what you are referring to, then let me know!
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Old 01-29-2011, 09:21 AM   #14
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From 2006



I.M.C. - Section 603.1.1, Vibration isolators.
Section 603.1.1, Vibration isolators, is hereby added to read as follows:
"603.1.1, Vibration Isolators. When equipment is supported by a concrete floor slab, vibration isolators shall be installed between mechanical equipment and metal ducts and shall be of an approved material not less than three inches (75 mm) nor more than ten inches (254 mm) in length."
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Old 01-29-2011, 09:29 AM   #15
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i have the 2006 book in front of me and there is no 603.1.1 only a 603.1 and does not have the section listed Vibration isolators

this code you listed states "When equipment is supported by a concrete floor slab" So not all furnaces are required to utilize flex air connectors.

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