Don't know.
Axial fans don't produce the static pressure that the radial ones do. So they are far more sensitive to pressure drop in the supply piping.
Most commercial units use a small radial blower. These may or may not be the same as the ones from Delta. In the case of BBQ guru, I believe they adapter only feeds through a single hole, and you plug the other holes with tape or a plug. This hole actually limits flow from the blower somewhat. Were you to install it without variable blower speed and no restriction it would not work exactly the same.
The micro damper on this site, also uses an axial fan. you can read that when people have tried to hook that up to some distribution pipes they couldn't get enough flow to get their temperature even to 225. That style needs more open supply because it's probably producing half the pressure of the radial one. Half the pressure is 1/4 the flow, roughly, when talking about flowing through the same piping.
I'd suggest you look at the micro damper threads for some ideas and information.
None of this is rocket science, but through trial and error some people before you have already worked out systems that perform acceptably, or fantastically, and you can learn from their history if you read the old forum posts.
Or you can follow their lead and duplicate a system that's already been proven.
As a brand new owner of the heater meter with a damper, I'm impressed by how well and how long it controls the temperature.
But here's the thing, the tuning parameters you need can change over 12 hr cook . This is because the ashe builds up , and the ash falls off, and the amount of coals decrease towards the very end of the cook. What worked fine a little while ago might start cycling, especially in that last couple of hours. that's when the temperature control gets touchy even doing it manually. Now a PID might cycle by plus or minus 5-10 F, by hand it might have been plus or minus 25F or more.
There is no substitute for being able to watch this graph, and change this from your couch or bed . None. going outside in the rain to screw with it will just leave you ready to spend the money you saved in the first place.
I highly suggest you spend the money for Wi-Fi capability. And the heater meter seems complicated at first, but it's really not. There really ought to be a single sticky explaining the whole thing more concisely. as it stands you have to sort through a lot of forum stickies and postings and read the wiki to get the whole picture of it.
You can monitor it , and change it, from your phone, it can send you email alarms, or texts, or even push messages. Connect to it directly, or via router, or internet. It's constantly being improved with the large community here that supports it.
The addition of a damper to shut off the natural convection flow is almost critical to being able to control the temperature well. without it you can have enough air drafting thru the fan, that the overshoot temperature doesn't come down, or at least doesn't come down as fast. Using a lower pressure fan that requires less restriction, I would expect this to be a problem without a damper.