https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/ Building science knowledge, HVAC design, & fun Sat, 09 Apr 2022 12:20:57 +0000 hourly 1 https://wordpress.org/?v=6.6.2 https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6870 Wed, 26 Mar 2014 22:52:31 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6870 Great post! Our company,
Great post! Our company, EcoVent Systems, automates vent control. We just put out a whitepaper on how important it is to monitor system conditions when opening and closing vents. When you don’t, you get many of the same problems described here.  
 
Check out the paper on our blog, and let us know if you’re interested in the system: http://ecoventsystems.com/blog/2014/03/new-whitepaper-when-is-closing-vents-a-bad-idea/

]]> https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6869 Sat, 22 Mar 2014 19:50:52 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6869 I see many of these items
I see many of these items when consulting homeowners. Thanks for all the great info!

]]> https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6868 Tue, 11 Mar 2014 05:33:18 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6868 I just knew, the moment I
I just knew, the moment I read the title, that we’d be subject to seeing the poor dead Possum yet again! 
 
The moldy sidewall supply grill may be the result of a crappy duct system moving well below 350-400 CFM / ton, but it could (indeed more likely is) the result of a shoddy envelope or ventilation issue causing abnormally high indoor humidity. 
 
Mold formation on painted metal surfaces is less common than mold formation on the surface of drywall since drywall surface has yummy cellulosic mold cavier whereas painted metal surfaces normally do not. 
 

]]> https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6867 Mon, 10 Mar 2014 18:36:41 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6867 Great article indeed. Thanks
Great article indeed. Thanks Clare, I didn’t realize the Ring 4 Club site was down. All fixed now.

]]> https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6866 Mon, 10 Mar 2014 16:36:50 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6866 The picture under “4.
The picture under “4. Leaky ducts may lead to poor humidity control” could be a supply air or return air grille. More than likely it is a supply grille covered with mold. The heading could imply that the cause is leaky ducts. Some even say that the moisture source is water droplets carried off the cooling coil! The source of the grille moisture is a high dewpoint in the room which could be from a number of sources/causes including leaking ducts. The cold supply air makes the grille cold. When the thermostat cycles the AC off, water vapour in the high dewpoint room air seeks the coldest surface and condenses on the grille. Most of your blog readers already know this but a few may benefit from an extended explanation.

]]> https://www.energyvanguard.com/blog/4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality/#comment-6865 Mon, 10 Mar 2014 09:00:24 +0000 http://energyvanguard.flywheelsites.com/?blog_post=4-ways-a-bad-duct-system-can-lead-to-poor-indoor-air-quality#comment-6865 Really nice post Allison!
Really nice post Allison!

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