Hello everyone,
we are building a KfW40 house and have been advised by several sources against using a cooker hood with exhaust ventilation, as you then need to worry about sealing it off when the hood is turned off. Exhaust ventilation is not very important to me anyway.
This raises the question: do you even need an exhaust hood with a ventilation system, or does the ventilation system take care of it automatically?
we are building a KfW40 house and have been advised by several sources against using a cooker hood with exhaust ventilation, as you then need to worry about sealing it off when the hood is turned off. Exhaust ventilation is not very important to me anyway.
This raises the question: do you even need an exhaust hood with a ventilation system, or does the ventilation system take care of it automatically?
@DNL As several others have already mentioned, the two devices are designed for different purposes.
My ventilation system manufacturer specifies a capacity of up to 30 m³/h (18 cfm) per ventilation duct for the design of the controlled residential ventilation system. This means that even if I run the ventilation system at a higher setting than currently, about 30 m³/h (18 cfm) will be drawn off at the diffuser in the kitchen because I have installed only one ventilation duct per diffuser (up to two ducts would be possible). A typical recirculating range hood can already process ten times that volume of air through its filters in the same amount of time, with the added benefit of cleaning the air from greasy particles.
For a house with this efficiency class, I would choose a recirculating range hood with an activated carbon filter.
My ventilation system manufacturer specifies a capacity of up to 30 m³/h (18 cfm) per ventilation duct for the design of the controlled residential ventilation system. This means that even if I run the ventilation system at a higher setting than currently, about 30 m³/h (18 cfm) will be drawn off at the diffuser in the kitchen because I have installed only one ventilation duct per diffuser (up to two ducts would be possible). A typical recirculating range hood can already process ten times that volume of air through its filters in the same amount of time, with the added benefit of cleaning the air from greasy particles.
For a house with this efficiency class, I would choose a recirculating range hood with an activated carbon filter.
Oh right, I didn’t think about the grease. Thanks for the tips.
We already have a recirculating hood. Some time ago, I learned that you should turn it on a few minutes before cooking so that the air around the stove starts moving properly. Still, we have quite a bit of grease buildup on the cabinets.
We already have a recirculating hood. Some time ago, I learned that you should turn it on a few minutes before cooking so that the air around the stove starts moving properly. Still, we have quite a bit of grease buildup on the cabinets.
G
garfunkel4 Nov 2016 20:45Energy saving or not, I would always recommend installing a range hood if it is structurally possible.
Filters cost money and are only a temporary solution.
The odors, grease, and moisture should simply be vented outside.
The only downside in new houses is likely to be the airtightness, which basically means that a window will -have to- be slightly open when the hood is running.
Filters cost money and are only a temporary solution.
The odors, grease, and moisture should simply be vented outside.
The only downside in new houses is likely to be the airtightness, which basically means that a window will -have to- be slightly open when the hood is running.
D
Doc.Schnaggls8 Nov 2016 10:12Hello,
for a house with a controlled ventilation system, I would definitely advise against an exhaust-only solution.
When I look at the performance of a modern exhaust hood and consider how much heat energy I am blowing out of the house, I feel like the controlled ventilation with heat recovery could have been avoided.
It gets especially complicated when a wood-burning stove is added into the mix, and if window contacts and a differential pressure monitor also need to be installed.
For example, we have a Berbel recirculation hood that features a kind of “catalyst” built into the integrated activated carbon filter, which reactivates the activated carbon automatically from time to time – so a replacement is probably never necessary.
The grease particles in the extracted air are thrown onto the duct walls by centrifugal force in a double “airfoil profile” design and can be easily wiped off after cooking.
You just need to make sure that this type of exhaust hood requires two electrical outlets – we had to come back later to install a second outlet.
Regards,
Dirk
for a house with a controlled ventilation system, I would definitely advise against an exhaust-only solution.
When I look at the performance of a modern exhaust hood and consider how much heat energy I am blowing out of the house, I feel like the controlled ventilation with heat recovery could have been avoided.
It gets especially complicated when a wood-burning stove is added into the mix, and if window contacts and a differential pressure monitor also need to be installed.
For example, we have a Berbel recirculation hood that features a kind of “catalyst” built into the integrated activated carbon filter, which reactivates the activated carbon automatically from time to time – so a replacement is probably never necessary.
The grease particles in the extracted air are thrown onto the duct walls by centrifugal force in a double “airfoil profile” design and can be easily wiped off after cooking.
You just need to make sure that this type of exhaust hood requires two electrical outlets – we had to come back later to install a second outlet.
Regards,
Dirk
S
Steffen808 Nov 2016 10:21We are installing the Bora cooktop extractor with external air exhaust again. It works very well. Check out YouTube for "BORA – downdraft cooktop extractor."
Best regards, Steffen
Best regards, Steffen
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