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 recirculation hoods (especially if it is supported by data)? Has anyone seen a recirculation hood design that is intrinsically superior? Or should we just continue the current advice to avoid these devices in favor of vented range hoods?

Views: 113

Replies to This Discussion

CO isn't adsorbed by activated charcoal filters.  There are other compounds that result while cooking - even on electric stoves - and I don't know anyone that has done extensive testing of food groups and which emissions are captured.  The more you cook - the more frequently the filters need to be changed.   A set of three or four charcoal filters for a stove hood can cost $10.  Manufacturers often suggest replacing the filters every several months -- which means that it could cost $40/yr in filter replacement.   Is that less or more than the equivalent energy cost if the air is vented outdoors?  No idea.   But I do know that the hoods do not generally have a means to detect a filter that is depleted.   Most the activated charcoal filters are really just capturing some of the grease and aromatic chemicals - perhaps providing a false sense of effectiveness.

Of course the effectiveness of that filter presumes also that you're really capturing all of the cooking fumes that are rising from the skillet.   LBNL and others have shown that capture range is a problem with a lot of hoods.

I'd suggest perhaps capturing some "cooking fumes" and doing a spectroscopy analysis of the stuff in the fumes - then look at how well an activated charcoal filter actually captures that bad stuff is a good step in the research.


Discussion Forum

Difficult retrofits

Started by Don Fugler. Last reply by Dennis Heidner Apr 15. 8 Replies

Kitchen Ventilation Resources

Started by Tom Phillips. Last reply by Tom Phillips Apr 8. 3 Replies

Depressurization/make-up air issues

Started by Don Fugler. Last reply by Dennis Heidner Apr 5. 40 Replies

Recirculating hoods

Started by Don Fugler. Last reply by Dennis Heidner Apr 3. 1 Reply

Good Eating with Reduced Cooking Emissions

Started by Linda Wigington. Last reply by Tom Phillips Dec 27, 2018. 7 Replies

Choosing a range hood

Started by Don Fugler. Last reply by Tom Phillips Sep 25, 2018. 7 Replies

Low velocity consequences

Started by Robert Bean. Last reply by Robert Bean Jun 14, 2018. 7 Replies

Latest Activity

Steve Taylor replied to Steve Taylor's discussion Moving sale - reduced in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"I do still have it."
14 hours ago
Noah Ray Sanders replied to Steve Taylor's discussion Moving sale - reduced in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Do you still have the DB with DG 1000"
14 hours ago
Chris Stratton posted a discussion

Okay to use 1" polyiso as a insulation base for 50 gallon heat pump water heater?

I am about to install a 50-gallon Rheem heat pump water heater in our garage at our house near…See More
15 hours ago
Noah Ray Sanders posted a discussion

Foam/Fiberglass Hybrid Insulation

Does anyone have any knowledge of installing fiberglass in the walls and foam insulating the attic…See More
Diane Chojnowski's video was featured

2X CODE INSULATION - Simple Trick!

In this episode Matt is visiting a nearly 100 year old Bungalow being re-built to Passive House standards. Architect Trey Farmer is building his family home and has some great tricks to double the insulation of a standard code built home without…
Elmec is now a member of Home Energy Pros Forum
Ed Minch commented on Blake Reid's blog post Blower Door Testing in Hawaii
"Glad to see they went with 5 ACH50.  This is very easy to achieve in even small houses and…"
Building Performance Institute shared Chris Dorsi's discussion on Facebook

© 2019   Created by Building Performance Association   Powered by

Badges  |  Report an Issue  |  Terms of Service