In many homes, cooking is the largest indoor source of air pollutants. Exposures can be higher in the kitchen compared to other places in the home. We can still enjoy the many benefits of cooking by installing and using range hoods that vent to the outdoors. This group will promote discussion about how to select effective range hoods, strategies to improve the efficiency of existing ventilation systems for kitchen pollutants, and what to do in homes that don’t have ducting already installed above the range. It will also touch on cooking and health studies, and how to reduce emissions through different cooking practices and appliance use.

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  • listen in for IAQ Radio on Friday 5/22 at 12PM EDT for an episode with Dr. Bill Bahnfleth from Penn State, covering "Mechanical Systems & COVID"

    https://www.iaqradio.com/
    IAQRadio
    The Voice of the Indoor Air Quality Industry
  • Thanks Linda for posting the report! We've had some great interest and I will look forward in hearing from this community on how we can engage better in the building space & what follow up actions and research are necessary.
  • Here is the link to the new report "Gas Stoves: Health & Air Quality Impacts & Solutions -- just released by Rocky Mountain Institute; https://rmi.org/insight/gas-stoves-pollution-health
    Gas Stoves: Health and Air Quality Impacts and Solutions
    Across the United States, millions of homes and apartments rely on gas appliances for heating and cooking.
  • TIME SENSITIVE!! Today 3-4 PM Webinar - Health & Air Quality Effects of Gas Cooking (and solutions)
    There is also a webinar on the findings of this report today Wed 5/6 from 3-4 PM and you can register here if interested: https://register.gotowebinar.com/register/3154948966960213008?emci=...
    https://register.gotowebinar.com/register/3154948966960213008?emci=
  • Thanks for the invite. I have been speaking recently with Bruce Nilles and Brady Seals of the Rocky Mountain Institute. They are preparing a study on NO2 emissions from gas ranges and ovens. It might be good to get them included in this group.
    • Thanks, Larry - happy to be here now!
  • The ROCIS Range Hood Guidance Document update - see below - has resulted in correspondence with researchers and ventilation experts. During those conversations, several interesting points emerged:
    - The range hood capture efficiency testing is progressing. Protocol is being developed and various fans have been run through the procedure. There are no results available yet on individual fans that can be shared with the public.
    - It is likely that all such tests will use the front burners on the stove as those are the ones most apt to be used by the cook and mostly likely to spill out emissions beyond the hood.
    - It is difficult to test microwave-integrated range hoods because of their configuration. Field testing of such installations would require development of suitable hoods, unless you can test the exhaust flow at the outside wall, which would be far easier. Outside wall testing on multi-family buildings would be tricky if not dangerous.
    - At present, fan sound ratings may not apply to the fan speed that most users will select.
    - The installed flow resistance of ducting and dampers may be higher than the resistance at which fans are tested. This means that fans in houses may have lower flow rates than expected and a lower capture efficiency.

    While some of this news may seem dispiriting, it actually is showing progress. We have not had proper capture efficiency testing up until now nor has anyone looked seriously at the testing and commissioning of fan installations. Once we have these processes in place, the fans we do install will be far more likely to serve their intended purpose.
  • Thank you for accepting me in your group!

       My work is about super-insulating and air tightening homes very well. So far all the jobs I have done had electric stoves with a decent range hood. I am working with a couple regarding their project, and they have a gas stove that they want to keep and their range hood is just not doing anything.  So they are willing to replace their range hood that has the power and exhaust outside. There is not a cabinet on top of the stove, which is great because we can install the range hood to the appropriate height, which is one of my questions, what is the optimal height?  What about sizing the hood?  Should the size be the same as the stove bellow? 

       I was also wondering if the shape is important or not. It seems that older hoods used to be open to help direct the byproducts to the fan, but as I search online for hoods, they are all flat at the bottom... is that an issue? 

    One last question... is there such thing as a hood with a sensor so it will go on when it senses cooking?  All my bathroom exhaust I will always have a humidity sensor, this way the fan goes on as soon as detects humidity and stays on well after the shower is over, removing all excess humidity. Having a sensor eliminates the human error of not using the device. 

    Thank you so much for reading my post, I am looking forward to your replies!

    Luis

  • I volunteer with a non-profit that provides free home repairs for low income seniors and people with disabilities.  One of the most common things we see is bad kitchen ventilation.  By "bad", I mean really, really bad.  In one case, the elderly homeowner had hired a big box home supply store's contractors to come out and install a new  kitchen fan.  After it was installed, she kept setting off the smoke-CO detectors in her house every time she cooked, so, of course, she disabled them. 

    I did an assessment, and discovered that the fan motor had burned out, and the fan blades weren't spinning.  A further inspection showed that not only weren't they spinning, but the knock-out panels behind the motor were still in place -- no air was getting past them.

    We installed a new kitchen exhaust fan, with proper venting, the following weekend, just in time for her to have the family over for Hannuka and make a bazillion latkes.  And this time, the smoke/CO alarms didn't go off.

  • Greetings,

    Please see two recent ROICS team member presentations from the North American Passive House Network 2018 conference held in Pittsburgh, PA.

    • Linda Wigington presented Beyond Dilution: Reducing Exposure to Particle Pollution in High Performance Homes.

    • Tom Phillips presented Healthy Kitchen Ventilation: Best Practices in Low-E Homes

    PDF's of the presentations are available here.

    Past ROCIS Events | ROCIS.org
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ROCIS Range Hood Guidance Document updated

Hello all, We have been working diligently over the past few months and have now updated the ROCIS Range Hood Guidance Document. The document has been adjusted and reformatted, with updates to content, supplements & citations.  For those of you who may not be familiar, the document is a resource for a varying degree of stakeholders seeking information on residential kitchen range hoods. This document provides guidance on the use, selection, caveats & installation of kitchen range hoods, pulling…

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5 Replies · Reply by Rob Mar 13

Proper range hood for natural gas 30" stove for an airtight home

Hello everyone,    This format is different from that I am used to... I am not familiar with the wall feature, so I first post it there instead of adding a discussion (which is probably why I did not get a reply) sorry about that, me bad! Thank you for accepting me in your group!   My work is about super-insulating and air tightening homes very well. So far all the jobs I have done had electric stoves with a decent range hood. I am working with a couple regarding their project, and they have a…

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3 Replies

Difficult retrofits

It is one thing to retrofit a range hood in a single family building with the stove against an outside wall. Conditions will often be more difficult than that. How do you retrofit a range hood into an apartment in a multi-storey building? In a house, what happens if the kitchen is set up to have the cooking surfaces against an inner wall? We have considered suggestions such as tying the range hood ducting into existing exhaust ducting (e.g. a large bathroom fan) or running ducting through a…

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Recirculating hoods

Beloved by builders, scorned by building scientists, and largely ignored by homeowners, recirculating hoods have a mixed reception. They do not require a wall penetration. They will not cause house depressurization. Some of the scientific testing shows them to be near useless in their current format but they could be a reasonable alternative to vented hoods if designed properly and maintained diligently. Is that asking too much?Is there anyone out there with positive experiences with…

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