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Your traverse may be inaccurate depending on the location. A reliable traverse should be located in a long straight duct which often is not available.

I will take a shot at this although I am not an expert in system balancing. You will need to get the static pressure upstream of the index damper, so drill a hole in the duct for your pitot tube. Open all the branch dampers fully. Throttle the index damper to 50pa upstream of the damper...

What is the neck size on the diffusers?

Thanks CanuckMiner. I appreciate the links you provided. There is a lot of good information at the the Martin site.

Does anyone have first-hand information with dustless material transfer chutes? When do they work? When do they not work? Can anyone direct me to any resources on this topic? I'm working on a project where we are weighing the benefits and liabilities of so-called engineered chutes versus...

What if the wind isn't blowing and it's a really hot day? You will cook in there. I guess I don't see his point about encouraging leaks either. I don't know much about this siding though.

I have some quick thoughts. Is your pitot tube is plugged? This happens when measuring dirty airflows such as industrial ventilation systems. Are there other branches feeding into the system that you can't see? Are you sure you fully understand the system? I don't know what you mean by...

Does anyone have knowledge on Passive Dust Control at transfer points for PRB coal applications? Under what circumstances does it work best? Or can you point me towards a resource? Thanks