There are two ways for unbalanced return air to produce moisture and mold problems during hot and humid weather : - the increased entry of outdoor air that substantially increases indoor relative humidity. - a negative pressure can draw moist air into wall cavities causing a moist interstitial microclimate, if indoor humidity is relatively low in the conditioned space.To prevent the creation of moisture and mold problems, properly sized return ducts should be provided.
How unbalanced return air encourages mold growth
![](https://www.aivc.org/sites/default/files/default_images/default_image_5.png)
Year:
2004
Bibliographic info:
ASHRAE IAQ Applications, Vol. 5, n° 4, Fall 2004, pp 4-5, 1 Ref.