cajunland Posted January 12, 2023 Share Posted January 12, 2023 This subject applies to plan design examples applying Code for kitchen remodel. Seems like gas appliances and ventilation are in the news a lot lately. I understand IRC requires a dedicated makeup-air system for range hoods that are larger than 400 cfm I am installing new Thermador 36" gas cooktop vented upwards and room is on a slab foundation. Minimum 400 cfm for vent hood fan. Best approach I can think of is use CA's HVAC and MEP catalogues to create Layout with the following: -ceiling register, spiral ducting, motorized damper and exterior wall vent cover in soffit for make-up air intake. To hot and humid here for roof intake, I think. I found this example at Fine Homebuilding / article by M. Holiday- How to Provide Makeup Air for Range Hoods, DECEMBER 2012/JANUARY 2013. Flex duct is illegal now. If I have missed this type example/detail for this specific subject on the Forums or in sample plans on CA web kindly reply. Link to comment Share on other sites More sharing options...
ACADuser Posted January 12, 2023 Share Posted January 12, 2023 FYI Another example. https://www.jlconline.com/how-to/hvac/simple-fresh-air-for-tight-houses_o 1 Link to comment Share on other sites More sharing options...
cajunland Posted January 12, 2023 Author Share Posted January 12, 2023 1 hour ago, solver said: Are you asking about how to design a makeup air system, or how to represent one in Chief? Fair question. I guess both. I'm not an engineer, but accuracy is important. Link to comment Share on other sites More sharing options...
cajunland Posted January 12, 2023 Author Share Posted January 12, 2023 1 hour ago, ACADuser said: FYI Another example. https://www.jlconline.com/how-to/hvac/simple-fresh-air-for-tight-houses_o Link to comment Share on other sites More sharing options...
cajunland Posted January 12, 2023 Author Share Posted January 12, 2023 OK That a good reference site CA advertises in. I'll check there too. This issue has significance to me as I have learned at great expense about HVAC venting and technical issues for my air conditioning systems. 5 ton system had to be replaced due to insufficient are return size and moisture issues. Only 4 years old. Link to comment Share on other sites More sharing options...
RobUSMC Posted January 12, 2023 Share Posted January 12, 2023 Just FYI 1 Link to comment Share on other sites More sharing options...
Bob-Roraback Posted January 13, 2023 Share Posted January 13, 2023 From the IRC commentary regarding this, It is becoming more common for residential kitchens to resemble commercial kitchens, both aesthetically and functionally. As a result, much larger-capacity range hoods are being installed which aggravates the already existing problem of a lack of adequate makeup air for all exhaust systems in the dwelling. Homes typically suffer multiple ills because of indoor negative pressures caused by an imbalance of exhaust air to makeup air. The problem is that air is being removed from the dwelling faster than air can leak back into the building by infiltration through cracks, gaps and flaws in the thermal envelope/air barrier. The typical home relies solely on infiltration for makeup air, and homes are being built much more airtight than in the past. Compounding this issue is the trend for much larger exhaust fans. The resulting pressure imbalance problem is a very real safety concern. 1 Link to comment Share on other sites More sharing options...
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