I installed one of these in my T@da
http://www.jamestowndistributors.com...ck+Ventilators
the reason I did not want the Sunforce was the ability to close this in the winter, which you can not do with the Sunforce. This Vetus also lets in
light and air and I was able to fit a 4" plug for winter time. I also installed mine on the side wall vs the roof. Less water leak chances.