Do you add louvers to the fan duct to affect the air volume?

Adding louvers to the fan duct opening will reduce the air volume.

In the pipeline system, any pipeline components are added, which will increase the pipeline pressure loss, and the pipeline pressure loss will increase, which will reduce the air volume;

As for how much will be reduced, see how much wind speed and the pressure loss coefficient of the blinds, generally if the wind speed is not large, less than 10 meters per second, the impact is not great, if the wind speed is large, the air volume will be much less;

Blinds are generally used to adjust the direction in which the wind blows out. As for snow blocking, it does not necessarily work. Because your original duct is blowing out the wind, normal snow will not be poured into it, there is no need to block the snow, but when the outside wind is large and the snow is blown to the air duct outlet, if the outside wind speed is greater than the wind speed blown by your duct, Wind and snow will still be poured into your indoor air duct, dripping after melting, and not installing blinds will not work;

To block the snow, add a louver-type damper. When the wind blows, close the louver.

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