Board Thread:Questions and Answers/@comment-68.113.115.91-20140101183323/@comment-5275054-20140101210527

A quick seach and I did come across the follow link from the Dayton Phoenix Group which I think makes some fo the sub-asseblies such as the fan units:

http://www.dayton-phoenix.com/productCategories.php?equipmentId=35&categoryId=62