Originally Posted by
Northwind
Chris,
I had 1/4 inch screen mounted right at the opening. The change I made was using the expanded sheet metal screen that they use to hang stucco or mortar to walls from Lowes. When it is pulled in manufacturing it has a draft angle to it which matches the transition angle needed to direct the flow to the VD radiator. I then mounted the screen with the proper draft angle to the entire length of the radiator, not the opening. It allows much more air flow to the system. I have heard of other people using honey-combed aluminum for the same purpose only this material is much cheaper. It fit my budget and works.