We have a rectangular wall box with a 125mm (5 inch) duct passing through it, as well as a second flap that simply allows air to flow either from outside to inside or vice versa. I’m wondering if this second flap is necessary. On the same floor (but in a different room), we have a fireplace and did not connect any tilt-window switches to the ventilation duct there. Is that why, or are there other reasons? I would like to switch from 125mm to 150mm (6 inch) because my kitchen specialist told me that with 125mm, the airflow maxes out at 500 m³/h (cubic meters per hour), and even if I use a hood with higher capacity, the air gets stagnant and nothing really works. What do you think about this statement?
Basically, a blower becomes a) louder and b) less efficient as the backpressure increases.
The smaller the cross-section, the longer the duct, and the more bends it has, the higher the backpressure will be.
It is difficult to make general statements. As a general rule, DN150 is recommended nowadays.
In my personal experience: don’t skip separate fresh air supply. Constantly tilting the window is annoying!
If you have a chimney, you will probably need a window contact switch without separate fresh air supply.
The smaller the cross-section, the longer the duct, and the more bends it has, the higher the backpressure will be.
It is difficult to make general statements. As a general rule, DN150 is recommended nowadays.
In my personal experience: don’t skip separate fresh air supply. Constantly tilting the window is annoying!
If you have a chimney, you will probably need a window contact switch without separate fresh air supply.
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