Can a Block Off Plate hold in too much heat.

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Garbanzo62

Minister of Fire
Aug 25, 2022
628
Connecticut
I was thinking about putting in a blockoff plate. My question is could that cause the firebox area to get too hot and warp the steel. The firebox is relatively small. Regency I2500 Insert, Exterior Chimney
 
I would not be concerned about an insert with block off plate ever if you are running the blower. Any thing can be over fired. But under non abusive running conditions a blockoff plate is how many or all inserts are designed to be installed.