Wall oven - INSTALLATION

I've been to some DIY sites and seen how wall ovens are installed. Friend is asking me for help with replacing one. Done it with stoves.
From the looks of it all, the oven must be covered with some kind of a FIRE RETARDENT material to keep heat in and also to keep from setting fire to anything nearby.
TRUE ??
This install will go into a plywood framed out box - one outside wall is masonry and other is plywood as part of the framed box for the oven. The original one has been in there for the past 40 years or so with no problems. Problem now is local gas company says you can no longer get parts for current problem. That is not the issue. Friend wants a new one at this point also.
BOTTOM LINE : Are these units lined with insulation to keep from overheating nearby materials ??
TIA
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Not really. There is some insulation but not like you would expect considering the temps that can be reached. Get some wall cabinet detail plans and you will find that there is an huge air space all around the oven. That is what stops the fires. As for the heat, well it ends up in the house.
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<< Friend wants a new one at this point also. >> << Are these units lined with insulation to keep from overheating nearby materials >>
Get a copy of the installation instructions for the unit you want and if still in doubt, check your local building codes. That should answer all your questions. Good luck.
Joe
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