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Prevent a Powerful Range Hood From Backdrafting Your Furnace

The article discusses the challenges associated with high-capacity range hoods and the critical need for proper makeup air to prevent dangerous backdrafting in residential heating systems. The issue arises when a powerful range hood, such as the 900 cubic feet per minute (CFM) unit planned for a new house in Southern California, exhausts a significant volume of air from a home. If adequate replacement air, known as makeup air, is not introduced, the negative pressure created inside the house can draw combustion gases from furnaces, water heaters, and fireplaces back into living spaces, posing a serious health risk due to carbon monoxide. Traditionally, solutions have involved configuring the HVAC system to supply makeup air, but a more integrated approach is often required. The article highlights a specific solution: a damper system, like those offered by Broan, that automatically opens to allow outside air into the house when the range hood is activated. This mechanical interlock ensures that makeup air is provided precisely when the high-volume exhaust fan is in operation, effectively balancing the pressure within the home and preventing backdrafting. The discussion extends to the broader implications of tightly constructed homes, which are becoming increasingly common due to advancements in building envelopes, such as those utilizing Insulated Concrete Forms (ICFs) and Structural Insulated Panels (SIPs). While these construction methods improve energy efficiency by reducing air leakage, they also exacerbate the makeup air problem by making homes less permeable to natural air infiltration. Simply opening a hole in the side of a house, as some basic makeup air ducts do, is not a universally viable solution, especially in climates with extreme temperatures where unconditioned outdoor air can lead to discomfort and energy waste. Several experts and commentators suggest that in colder climates, or where precise temperature control is desired, more sophisticated systems like Heat Recovery Ventilators (HRVs) and Energy Recovery Ventilators (ERVs) should be considered. These units exchange heat between the outgoing exhaust air and the incoming fresh air, minimizing energy loss. However, the article points out a perceived lack of practical, real-world data on the effectiveness of these subsystems in conjunction with high-capacity range hoods and questions why the industry has been slow to adopt this technology more broadly. The article also touches upon the debate regarding the necessity of such powerful range hoods. Some argue that these appliances represent unnecessary consumption and energy waste, advocating for simpler cooking methods or outdoor setups. Others contend that high-capacity hoods are essential for those who frequently cook "real food" that generates significant smoke and odors, ensuring good indoor air quality. They emphasize that when properly balanced with a well-designed makeup air system, the energy impact of these hoods can be minimal during actual use. The ideal solution often involves variable-speed exhaust fans and makeup air dampers that supply unconditioned air directly into the hood's capture area, or, with proper filtration, through a heat exchange system to mitigate temperature impacts. The emphasis remains on designing balanced ventilation systems that protect against backdrafting while supporting modern culinary practices within energy-efficient homes. #RangeHood #MakeupAir #HVACSystem #Backdrafting #Ventilation #EnergyEfficiency #HomeSafety #KitchenDesign #BuildingScience #RangeHood #MakeupAir #HVACSystem #Backdrafting #Ventilation #EnergyEfficiency #HomeSafety #KitchenDesign #BuildingScience
170 months ago
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