Quote:
Originally Posted by PerlenFlo
My main question is: Why do you use that funnel?
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The funnel does help the system draw in much the same way a pyramid shaped hood does. All of the commercially available ventilators like this have these. I believe the issue is that the fan is undersized and there is flexible ducting used. Based on what I see in the picture you should have a fan that will move twice this amount of air or 800-900 CFM. Part of the problem is also the flexible ducting you used. It creates turbulence and adversely effects the efficiency of the system. Based on my experience this system will be underpowered.