Thank you for your question on the model 634 roof cap. You can download the 634 installation instructions from our web site. It explains that the duct work does not actually connect to the roof cap. The duct work will come up through the roof and stick up approximately ¾” above the roof surface. The roof cap gets installed over the top of the duct work. Please contact the Technical Service Department at 800-637-1453 for further assistance.
Date published: 2014-04-17