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TOPIC: Small duct runs to plenum, why?

Small duct runs to plenum, why? 6 years 5 months ago #53786

1997 house in Orange County Ca has a small duct inside of the plenum, under the furnace filter. I can't see where it comes from but it has a closed baffle inside. Why would one put a duct here?
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Re: Small duct runs to plenum, why? 6 years 5 months ago #53787

I would suspect that the duct goes to the exterior to bring in fresh air. But this is making an assumption based upon insufficient information.

If you're going to talk about this you need to go find where the thing comes from and all pertinent information. Otherwise all replies to your question are unsubstantiated.

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Home Inspector
HVAC Systems Design
ITC Level III Thermography - Building Science Thermographer
Thermal Imaging
Serving Clarksville - Nashville TN and the Mid TN area
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www.ThermalImagingScan.com
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Re: Small duct runs to plenum, why? 6 years 5 months ago #53814

The end of that duct looks awful dirty, almost like it is the dryer duct...

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There is nothing sweeter than the smell of fresh cut grass on a baseball infield, the click of a wooden bat and the taste of a hot dog at a warm sunny daytime double-header.

Re: Small duct runs to plenum, why? 6 years 1 month ago #54891

David is right.  It's a California thing.  I had one on my house when I bought it.

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Bill Bryan
CREIA Candidate
Thermographer

Re: Small duct runs to plenum, why? 6 years 1 month ago #54892

I had not seen the pic's yet.
The closed damper is correct by the way. Even closed, they allow a lot of air by-pass. You will find most fresh air dampers closed like this.

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Home Inspector
HVAC Systems Design
ITC Level III Thermography - Building Science Thermographer
Thermal Imaging
Serving Clarksville - Nashville TN and the Mid TN area
www.MidTnInspections.com
www.ThermalImagingScan.com
To link to my pages:
www.midtninspections.com/link-submission

Re: Small duct runs to plenum, why? 6 years 3 weeks ago #55182

I have seen these also and put this in my report. Most buyers have no idea what it is.

A Controlled mechanical ventilation system is installed in your home. Mechanical ventilation assists in controlling the humidity, contaminants, air borne particles, and general air quality. With single thermostat systems, periodic whole house mixing is critical to providing the best overall level of perceived IAQ (indoor air quality) and comfort.

The acceptable air quality has to be maintained by supplying adequate air of specified quality and quantity in the space. The ventilation of the home can be done by natural ventilation by means of windows and skylights or by mechanical ventilation.

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David Garton
Eagle Eye Inspection Services
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Serving Sacramento, CA. and the surrounding areas
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