Hello everyone,
We are still in the shell construction phase, but the question about the ventilation system for a desired island range hood has come up.
Should we vent the range hood through the roof or through an exterior wall?
What do you think? Opinions and experiences are welcome.
The most important question in general:
Is venting through the roof with a duct length of about 7 meters (23 feet) even feasible or practical?
A few more considerations:
Exterior wall:
Pros
- shorter duct length, about 2–3 meters (6.5–10 feet)
Cons
- dirt on the exterior wall from dripping grease!?
- west side, wind may blow the fumes back inside
- possible thermal bridge due to the wall penetration
Roof:
Pros
- weather conditions don’t matter
- external motor in the attic reduces noise
- no thermal bridge!?
Cons
- about 7 meters (23 feet) duct length
- high costs
Here are some key details that might be relevant:
- No controlled mechanical ventilation system
- Open kitchen to the living room
- Fireplace planned in the living room
- Chimney draws air from above
- We are not in favor of recirculating hoods
We are still in the shell construction phase, but the question about the ventilation system for a desired island range hood has come up.
Should we vent the range hood through the roof or through an exterior wall?
What do you think? Opinions and experiences are welcome.
The most important question in general:
Is venting through the roof with a duct length of about 7 meters (23 feet) even feasible or practical?
A few more considerations:
Exterior wall:
Pros
- shorter duct length, about 2–3 meters (6.5–10 feet)
Cons
- dirt on the exterior wall from dripping grease!?
- west side, wind may blow the fumes back inside
- possible thermal bridge due to the wall penetration
Roof:
Pros
- weather conditions don’t matter
- external motor in the attic reduces noise
- no thermal bridge!?
Cons
- about 7 meters (23 feet) duct length
- high costs
Here are some key details that might be relevant:
- No controlled mechanical ventilation system
- Open kitchen to the living room
- Fireplace planned in the living room
- Chimney draws air from above
- We are not in favor of recirculating hoods
Umbau-Susi20 Aug 2014 19:22If you choose a fireplace or wood stove with its own air supply, according to our chimney sweep, you don’t need the toggle switch.
Because of the distance in meters, you will probably need a wall box with a fan. It’s best to check the Berbel website for details.
We connected the exhaust hood directly to the wall box and were therefore able to do without the fan.
Berbel also offers specific island hoods.
Sylvia
Because of the distance in meters, you will probably need a wall box with a fan. It’s best to check the Berbel website for details.
We connected the exhaust hood directly to the wall box and were therefore able to do without the fan.
Berbel also offers specific island hoods.
Sylvia
B
baumann201315 Feb 2015 16:28I would like to revisit this topic.
So far, we had decided on a vented range hood for the new kitchen because of its advantages over a recirculating hood (it removes moisture and operates more quietly). However, we are now having second thoughts regarding issues like grease deposits on the exterior wall below the wall vent box and thermal bridging. We would like to avoid these problems.
What should be considered when designing the exhaust duct and choosing the right wall vent box to prevent these issues in the long term?
For your information: We have selected the Refsta Vento III ceiling-mounted hood, the finished room height will be approximately 2.50 m (8 feet 2 inches), and a duct slightly over 2 m (6 feet 7 inches) long will need to run horizontally below the ceiling to the exterior wall with a wall vent box. The kitchen planner suggested a duct with a 15 cm (6 inches) diameter. We would like to use a round duct going upwards toward the ceiling and then an oval duct running horizontally (with a very slight slope) to the outside.
So far, we had decided on a vented range hood for the new kitchen because of its advantages over a recirculating hood (it removes moisture and operates more quietly). However, we are now having second thoughts regarding issues like grease deposits on the exterior wall below the wall vent box and thermal bridging. We would like to avoid these problems.
What should be considered when designing the exhaust duct and choosing the right wall vent box to prevent these issues in the long term?
For your information: We have selected the Refsta Vento III ceiling-mounted hood, the finished room height will be approximately 2.50 m (8 feet 2 inches), and a duct slightly over 2 m (6 feet 7 inches) long will need to run horizontally below the ceiling to the exterior wall with a wall vent box. The kitchen planner suggested a duct with a 15 cm (6 inches) diameter. We would like to use a round duct going upwards toward the ceiling and then an oval duct running horizontally (with a very slight slope) to the outside.
P
PeterLustig4915 Feb 2015 19:14I currently prefer the wall box by Naber. It only opens when in use and directs the exhaust air away from the exterior wall. It is also supposed to pass a blower door test...
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D
Doc.Schnaggls15 Feb 2015 19:17Or maybe swap out the hood as well.
Berbel offers some nice grease separators using centrifugal force – so there’s no more dripping on the exterior wall...
Berbel offers some nice grease separators using centrifugal force – so there’s no more dripping on the exterior wall...
Umbau-Susi15 Feb 2015 20:05We have been using a Berbel wall box for almost two years now, and there is no dripping on the house wall. The box opens when the hood is turned on and closes after a set period once it is turned off.
Sylvia
Sylvia
B
Bauexperte16 Feb 2015 12:27Hello Doc,
Yes, a dream – eyes shining.....
......... but the prices listed are quite steep
Regards, Bauexperte
Doc.Schnaggls schrieb:
Or maybe replace the hood.
Berbel has some nice grease separators based on centrifugal force – so nothing will drip anymore on the house wall...
Yes, a dream – eyes shining.....
......... but the prices listed are quite steep
Regards, Bauexperte
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