Steadfastly,
Welcome to JOF
You may want to contact Jayco Customer Support directly (phone and/or e-mail) along with your 347BHOK "VIN'. I would request the following:
* Furnace manufacture name and model number.
* Outer wall framing schematics (install your own access panel).
* Suppler name who manufacture's outside wall furnace access panels.
The following JOF thread may be a helpful read while waiting for additional member responses:
https://www.jaycoowners.com/forums/f...e-93563-3.html
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)