ᐅ Location of exhaust and supply air valves for the central ventilation system
Created on: 24 Mar 2026 13:49
C
ChanceChipC
ChanceChip24 Mar 2026 13:49Hello everyone,
We received the "ventilation plan" for our new build.
The plan basically just says "place the vents in front of the windows."
I'm concerned that this might not be the most effective approach, but maybe I’m misunderstanding and would appreciate some clarification.
The house is about 145sqm (1,560 sqft) and the ventilation system is a Bosch Vent 5001c.
My concerns:
Ground floor:
Is there any airflow actually reaching the TV area?
Would it make more sense to have the exhaust vent in the kitchen somewhere other than above the kitchen island?
Upper floor:
Exhaust vent in the dressing room? Wouldn’t the air just flow from one vent to the other without proper circulation? Also, a louder exhaust vent there could be annoying in the bedroom nearby.
Bathroom upstairs:
Is it most effective to have the exhaust vent near the shower wall, basically between the sink and the shower? Otherwise, wouldn’t the air from the shower have to move all the way around the wall first?
Hopefully someone here knows about this and can offer an assessment. Our “construction manager for building services” hasn’t shown much motivation so far and has already given us questionable information regarding the photovoltaic system. That makes me a bit worried about this as well.
We received the "ventilation plan" for our new build.
The plan basically just says "place the vents in front of the windows."
I'm concerned that this might not be the most effective approach, but maybe I’m misunderstanding and would appreciate some clarification.
The house is about 145sqm (1,560 sqft) and the ventilation system is a Bosch Vent 5001c.
My concerns:
Ground floor:
Is there any airflow actually reaching the TV area?
Would it make more sense to have the exhaust vent in the kitchen somewhere other than above the kitchen island?
Upper floor:
Exhaust vent in the dressing room? Wouldn’t the air just flow from one vent to the other without proper circulation? Also, a louder exhaust vent there could be annoying in the bedroom nearby.
Bathroom upstairs:
Is it most effective to have the exhaust vent near the shower wall, basically between the sink and the shower? Otherwise, wouldn’t the air from the shower have to move all the way around the wall first?
Hopefully someone here knows about this and can offer an assessment. Our “construction manager for building services” hasn’t shown much motivation so far and has already given us questionable information regarding the photovoltaic system. That makes me a bit worried about this as well.
Hello ChanceChip,
At first glance: this is a completely normal and common design. The valves on the window side are no coincidence; this is called supply ventilation. Fresh air comes in from outside and then gradually moves through the room towards the hallway or to the exhaust rooms.
Regarding your points:
TV corner: You don’t need a directed airflow there. The system works by diluting the air volume in each room. The air distributes throughout the entire space and mixes. The corner is also covered, just without any noticeable draft (which you don’t want anyway).
Kitchen: Exhaust air is deliberately not placed over the island. The controlled residential ventilation system is only intended for basic hygiene. Greasy vapors will eventually damage the ducts despite filters. For that, you need a separate hood with an appropriate filter.
Dressing room / bedroom: Having the supply air in the bedroom and the exhaust air in the dressing room is actually the best case. This creates a cross-flow that keeps the closet area directly fresh. With these distances, no short-circuiting occurs.
Bathroom / shower: Directly in the shower is often unpleasant due to evaporative cooling on wet skin. The current position is suitable; humidity naturally distributes immediately throughout the room due to physical reasons.
Noise: This is not a matter of position. If proper sound attenuators for ventilation systems are installed and the system is balanced according to standards (DIN), you won’t hear anything in the bedroom.
What I would look into: ask for the calculation of volume flows and check if sufficient sound attenuators are included in the plan. In the end, this is more important than the exact position of the valve.
I hope this helps you.
At first glance: this is a completely normal and common design. The valves on the window side are no coincidence; this is called supply ventilation. Fresh air comes in from outside and then gradually moves through the room towards the hallway or to the exhaust rooms.
Regarding your points:
TV corner: You don’t need a directed airflow there. The system works by diluting the air volume in each room. The air distributes throughout the entire space and mixes. The corner is also covered, just without any noticeable draft (which you don’t want anyway).
Kitchen: Exhaust air is deliberately not placed over the island. The controlled residential ventilation system is only intended for basic hygiene. Greasy vapors will eventually damage the ducts despite filters. For that, you need a separate hood with an appropriate filter.
Dressing room / bedroom: Having the supply air in the bedroom and the exhaust air in the dressing room is actually the best case. This creates a cross-flow that keeps the closet area directly fresh. With these distances, no short-circuiting occurs.
Bathroom / shower: Directly in the shower is often unpleasant due to evaporative cooling on wet skin. The current position is suitable; humidity naturally distributes immediately throughout the room due to physical reasons.
Noise: This is not a matter of position. If proper sound attenuators for ventilation systems are installed and the system is balanced according to standards (DIN), you won’t hear anything in the bedroom.
What I would look into: ask for the calculation of volume flows and check if sufficient sound attenuators are included in the plan. In the end, this is more important than the exact position of the valve.
I hope this helps you.
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