I want to set up my baro damper. I just ordered a cheap digital manometer from eBay as well as a 4" right angle magnetic probe and am trying to figure out where to drill the hole for the probe. There is a short single wall transition piece (5" to 6") right after boiler exit before it changes to double wall DVL. After the transisiion, there's a 45 deg elbow and then a T that the baro damper is connected to. If I don't drill the hole in the transition piece I have to drill it in the double wall T. I'm leaning toward the transition piece, but it doesn't matter if it's that close to the boiler, does it? The probe will be metal. Perhaps the hole could also be used at some point to measure boiler performance. What do you think?
Picture below:
![Digital Manometer And Where To Put Hole For Probe Digital Manometer And Where To Put Hole For Probe](https://www.hearth.com/talk/data/attachments/141/141279-c8ebb8e48f496fa2c4d76cd2eb213cfc.jpg)
Picture below:
![Digital Manometer And Where To Put Hole For Probe Digital Manometer And Where To Put Hole For Probe](https://www.hearth.com/talk/data/attachments/141/141279-c8ebb8e48f496fa2c4d76cd2eb213cfc.jpg)