Hello,
we want to build our kitchen with a relatively open design. We currently have a similar setup in a rented house with a fairly efficient ducted extractor fan (600 m³/h (353 cfm) rated capacity, about 0.5 m (1.6 ft) aluminum flexible duct DN150 to the wall vent) and are satisfied with its performance.
What we are not happy with is the requirement to always have a window open.
In the new build, the kitchen is not located on an exterior wall, so the ductwork for the extractor will need to be several meters longer. One option would be about 4-5 m (13-16 ft) of duct running through the roof, which would likely require at least two 90° elbows. Alternatively, a 90° elbow could be used to run the duct horizontally through the utility room towards the north, again about 4-5 m (13-16 ft) of duct. Both options would allow the fan unit to be installed outside of the kitchen, which would help reduce noise levels.
We still need to consider fresh air supply. Would it be possible to run fresh air intake under the floor slab and have an external intake chimney similar to those used for centralized mechanical ventilation systems? This would require a motorized damper to ensure airtightness when the system is not in operation.
Or is all this effort not justified, and should we just opt for a recirculation system instead?
we want to build our kitchen with a relatively open design. We currently have a similar setup in a rented house with a fairly efficient ducted extractor fan (600 m³/h (353 cfm) rated capacity, about 0.5 m (1.6 ft) aluminum flexible duct DN150 to the wall vent) and are satisfied with its performance.
What we are not happy with is the requirement to always have a window open.
In the new build, the kitchen is not located on an exterior wall, so the ductwork for the extractor will need to be several meters longer. One option would be about 4-5 m (13-16 ft) of duct running through the roof, which would likely require at least two 90° elbows. Alternatively, a 90° elbow could be used to run the duct horizontally through the utility room towards the north, again about 4-5 m (13-16 ft) of duct. Both options would allow the fan unit to be installed outside of the kitchen, which would help reduce noise levels.
We still need to consider fresh air supply. Would it be possible to run fresh air intake under the floor slab and have an external intake chimney similar to those used for centralized mechanical ventilation systems? This would require a motorized damper to ensure airtightness when the system is not in operation.
Or is all this effort not justified, and should we just opt for a recirculation system instead?
Küchenliebe17 Jun 2015 16:28Hello,
Are you even allowed to install an exhaust air system in your new build?
For certain KfW-certified new constructions, it is not always permitted due to energy efficiency requirements.
Because of this, recirculating air technology has improved significantly in recent years.
In general, an exhaust system with an external motor is the top solution.
The duct length should be at least 3 meters (10 feet) to avoid resonance noise, which can occur if the length is shorter.
So this shouldn’t be an issue for you.
A separately installed supply air duct is certainly possible, but it’s questionable whether the effort is worthwhile.
Alternatively, an internal motor with a special wall box could be used.
This wall box then features a separate supply air opening.
Best regards
Are you even allowed to install an exhaust air system in your new build?
For certain KfW-certified new constructions, it is not always permitted due to energy efficiency requirements.
Because of this, recirculating air technology has improved significantly in recent years.
In general, an exhaust system with an external motor is the top solution.
The duct length should be at least 3 meters (10 feet) to avoid resonance noise, which can occur if the length is shorter.
So this shouldn’t be an issue for you.
A separately installed supply air duct is certainly possible, but it’s questionable whether the effort is worthwhile.
Alternatively, an internal motor with a special wall box could be used.
This wall box then features a separate supply air opening.
Best regards
D
Doc.Schnaggls19 Jun 2015 13:36Hello,
take a look at the recirculation hoods from "Berbel."
We have a Berbel with a catalyst in the activated carbon filter, so we never have to replace the filter media anymore.
We have been using the recirculation hood since February 2015 and are more than satisfied with it.
Regards,
Dirk
take a look at the recirculation hoods from "Berbel."
We have a Berbel with a catalyst in the activated carbon filter, so we never have to replace the filter media anymore.
We have been using the recirculation hood since February 2015 and are more than satisfied with it.
Regards,
Dirk
Umbau-Susi19 Jun 2015 14:19I run my Berbel only in exhaust mode -> never anything else.
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