Dave,
I'll ask Hank for clarification at the event. I'm looking for things bigger than a sheetmetal screw. We all saw Jim Strader's fire video (and pics) from COTA. Small holes can also be areas for fire to come thru. Worst case go crazy with a tube of the fire retardant "fireplace caulking" on the small holes and I personally wouldn't see any issues with it.
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