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The US Standard ASHRAE 62.1-2007: Ventilation for Acceptable Indoor Air Quality, only requires 4% of net floor area to be operable. This creates the potential for increased energy consumption where natural ventilation is provided by operable windows where supplemental air conditioning is provided, in addition to generally poor control over ventilation rates during hot summer or cold winter ...
The rising warm air reduces the pressure in the base of the building, drawing cold air in through either open doors, windows, or other openings and leakage. During the cooling season, the stack effect is reversed, but is typically weaker due to lower temperature differences.
Reduced heat flow also helps prevent condensation [3] [4] [5] which is triggered when the temperature of the inside surface falls below the dew point. Assuming an outside temperature of 0 °C with wind velocity 7 m/s (15 mph; 24 km/h) and inside temperature 20 °C condensation occurs at only 30%RH relative humidity with a single-glazed system ...
Sep. 27—JAMESTOWN — Storm windows help prevent any air infiltration in homes with older, single-pane glass windows, according to Clyde Schmautz, manager of Infinity Building Services.
The function of a vapor barrier is to retard the migration of water vapor. A vapor barrier is not typically intended to retard the migration of air. This is the function of air barriers. [8] Air is mixed with water vapor. When air moves from location to location due to an air pressure difference, the vapor moves with it.
It can be via operable windows, louvers, or trickle vents when spaces are small and the architecture permits. ASHRAE defined Natural ventilation as the flow of air through open windows, doors, grilles, and other planned building envelope penetrations, and as being driven by natural and/or artificially produced pressure differentials. [1]
Cross-breezes work when two windows are opposite of each other. Cross ventilation is a natural phenomenon where wind, fresh air or a breeze enters upon an opening, such as a window, and flows directly through the space and exits through an opening on the opposite side of the building (where the air pressure is lower).
Fix: Hire an air duct cleaning company to thoroughly clean your ducts if you suspect there’s mold or built-up debris. Make sure to perform general HVAC maintenance regularly, and if your system ...
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