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Old 02-08-2013, 07:42 PM   #1
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Customer hates noisy new furnace


Just installed a new goodman 80k furnace in customers house.
Customer called today complaining about how noisy the new furnace is compared to her old Gaffers and Sattler. The furnace is in the standard closet location in the hallway and apparently the noise is just the standard jet noise from the burners which I explained is inherent in all the 80% furnaces.
Her hardwood floors are not helping either.
Can anyone recommend some type of material to line the closet walls to insulate the noise?
Thanks a lot

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Old 02-08-2013, 07:47 PM   #2
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Customer hates noisy new furnace


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Originally Posted by kirwinjd View Post
Customer called today complaining about how noisy the new furnace is compared to her old Gaffers and Sattler.
"They all do that ma'am"

Is the bill paid?

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Old 02-08-2013, 08:08 PM   #3
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Customer hates noisy new furnace


Foam Rubber...............Earplugs
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Old 02-08-2013, 08:18 PM   #4
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Customer hates noisy new furnace


Could be a bad install with vibrating sheet metal.

Have looked and felt everything? - Vibrations can be cured as long as you understand the harmonics of tin.

Dick
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Old 02-08-2013, 08:31 PM   #5
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Customer hates noisy new furnace


Where does the combustion air come from.
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Old 02-08-2013, 08:52 PM   #6
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Customer hates noisy new furnace


what is the gas pressure..some times installing a regulator setting manifold pressure to 3.2 will quiet the inshot burnners down for closet installation...ben sr
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Old 02-08-2013, 09:43 PM   #7
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Customer hates noisy new furnace


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Originally Posted by concretemasonry
Could be a bad install with vibrating sheet metal.

Have looked and felt everything? - Vibrations can be cured as long as you understand the harmonics of tin.

Dick
It's not a bad install but thanks anyways. Everything is tight. It's a brand new furnace and its running as smoothly as the other 25 + I installed last year. Everyone is different and most people are ok with it. I do get the 10% of customers who are noise sensitive and it may not even be the level of noise but a different noise. People are so used to the old furnace for 30 years, they no longer hear it
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Old 02-08-2013, 09:55 PM   #8
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Customer hates noisy new furnace


Just because everything is tight does not make it good. Vibration and harmonics can get complicated and frustrating. Often, it can cause noises and in some cases some isolation can reduce the noise from everything attached to the furnace unless you want do do ductwork modifications. I had a rock solid professional furnace installation and discovered the noise were from the ductwork vibrations of the ducts. - I eliminated much of the noise with a bungee cord tight around a major duct and tied it up to a joist to change the harmonics and the cord was a spare and was uded in my utility room.

Dick
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Old 02-08-2013, 10:03 PM   #9
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Customer hates noisy new furnace


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Originally Posted by concretemasonry
Just because everything is tight does not make it good. Vibration and harmonics can get complicated and frustrating. Often, it can cause noises and in some cases some isolation can reduce the noise from everything attached to the furnace unless you want do do ductwork modifications. I had a rock solid professional furnace installation and discovered the noise were from the ductwork vibrations of the ducts. - I eliminated much of the noise with a bungee cord tight around a major duct and tied it up to a joist to change the harmonics and the cord was a spare and was uded in my utility room.

Dick
Thanks again and your absolutely right about the issue of harmonics. It can be complex. What the customer is complaining about is the sound of the flames being jetted into the burners vs the old ribbon style burners.
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Old 02-08-2013, 10:08 PM   #10
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Customer hates noisy new furnace


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Originally Posted by ben's plumbing
what is the gas pressure..some times installing a regulator setting manifold pressure to 3.2 will quiet the inshot burnners down for closet installation...ben sr
Thanks for the advice. Sounds like a good idea. I'll check it.
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Old 02-08-2013, 10:11 PM   #11
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Customer hates noisy new furnace


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Where does the combustion air come from.
Combustion air coming from attic screen above.
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Old 02-08-2013, 10:19 PM   #12
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Customer hates noisy new furnace


I hear Nothing!
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Old 02-08-2013, 10:27 PM   #13
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Customer hates noisy new furnace


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I hear Nothing!
I wish lol But with that attitude, I'll also not hear my phone ring from customers who don't call contractors with a bad reputation
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Old 02-09-2013, 05:57 AM   #14
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Customer hates noisy new furnace


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Originally Posted by kirwinjd View Post
Combustion air coming from attic screen above.
1 inch duct board glued to the walls and door, or 1 inch thick duct wrap glued to the walls will reduce the amount of noise.

Foil side toward furnace.
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Old 02-09-2013, 09:46 AM   #15
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Customer hates noisy new furnace


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Originally Posted by kirwinjd View Post
Thanks for the advice. Sounds like a good idea. I'll check it.
Dropping the manifold pressure to 3.2

Personally I would never do that as you risk the chance of delayed ignition. inlet pressure can vary but outlet pressure should always be 3.5. dropping the pressure reduces the velocity/speed of the gas and may change the timing of how fast the crossovers work or even the angle of the gas hitting the igniter. carrier and rheem have some issues with velocity thru the burner box and ignition patterns so I would not go there. problem may occur when new and probably will occur a few years from now when the burners get dirty or rust/corrosion on the ends of them which is unavoidable.

Duct insulation attached to the door and walls of the closet would be my choice. Check the manifold pressure anyway as it may be above 3.5 and overfired. seen that happen a lot.

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Last edited by yuri; 02-09-2013 at 09:59 AM.
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