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I have a fan that blows 93,4 m³/h of air with a static pressure of 2,61 mm H₂O and I am wanting to ensure that air gets blown along the duct and out the vent. My current grid vent means my fan competes with the wind when it's blowing parallel to the vent.
After some quick Googling I found some possible solutions that will help prevent or reduce the amount of back draft:
1) Add a 90-degree turn to the vent to prevent wind from blowing straight into the duct but I am not sure how successful this will be on windy days
http://www.builderdepot.co.uk/manrose-100mm-4-brown-external-hooded-weatherproof-cowl.html
2) Maybe an exhaustion valve but I am not exactly sure what “The valves provide high initial resistance with wide throttling capability which is necessary to offset the relatively high system resistances.” means in practice
http://www.waterloo.co.uk/product-models/vb-exhaust-valves/
3) Air Volume Control Dampers might be another solution that have “been designed to provide positive control of airflow” but I am not exactly sure how it achieves that
http://www.waterloo.co.uk/product-models/wdd-control-dampers/
Have any of you used any of those products before or have any advice on the best way I could reduce the back draft?
Thanks
After some quick Googling I found some possible solutions that will help prevent or reduce the amount of back draft:
1) Add a 90-degree turn to the vent to prevent wind from blowing straight into the duct but I am not sure how successful this will be on windy days
http://www.builderdepot.co.uk/manrose-100mm-4-brown-external-hooded-weatherproof-cowl.html
2) Maybe an exhaustion valve but I am not exactly sure what “The valves provide high initial resistance with wide throttling capability which is necessary to offset the relatively high system resistances.” means in practice
http://www.waterloo.co.uk/product-models/vb-exhaust-valves/
3) Air Volume Control Dampers might be another solution that have “been designed to provide positive control of airflow” but I am not exactly sure how it achieves that
http://www.waterloo.co.uk/product-models/wdd-control-dampers/
Have any of you used any of those products before or have any advice on the best way I could reduce the back draft?
Thanks