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How much time and money is it going to take and will it be justifiable. (Obviously thats for the customer to decide) I'd be more interested in knowing why the customer wants such a device. The...

Nice catch. I found a similar situation with a Ruud set up for down flow. Had two holes and the flame rod was out into the wrong one.

If the 47k shirt cycle it doesn't make much sense to go larger in any fashion...chances are it might not run off 1st of the smaller unit and if it does, it should be limited

My bad! You did day Manual D. i got nothing off the top of my head shy of good ol pin and paper

I find it odd that the oem placed them on the burner??? Find a parts breakdown...might give you a better idea

Try coolcalc.com. i know of a few guys that get along with it well. Similar results to Wrightsoft...

Its not a good idea. At some point its not worth reengineering things. Why is he wanting it?

Is the unit grounded in the junction box, which grounds the furnace up to the burners

You are correct for not signing them off. Its a very good chance the contractor is not designing their ducts. It's a common and well know fact the majority of the industry uses .1" friction rate on...

Hands down Vito is the ticket. They are kinda steep but the service for warranty claims is tough to beat. You get what you pay for! Be sure to purchase from an authorized dealer for them to honor...

I forgot to mention that adding activated carbon into the mix should help. Not familiar with in bulk though, thinking iqair could assist in that too...

You're on the right track with the fresh air...24/7 ventilation. A minimum MERV 13. 11 if you really have to stay lower.
Find iqair on line. They may be able to assist you for your situation. ...