Vent free conversion, hood question

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Buffyandsneaky

New Member
Aug 7, 2018
1
Atlanta
what is the rule of thumb for the depth sticking out from a fireplace opening of installing a hood to protect the mantle from excessive heat? I see hoods out there 4” 6” 8” depth but not really any explanation as to which one to choose. If your mantle is say 3’ above the fireplace opening and it sticks out 8” does that mean you want an 8” hood to divert the heat?
 
Check the install manual. If a hood is required, the specified depth & clearances will be in there.