[Avodah] oven timer

[Saul.Z.Newman at kp.org]

i can't find a source delineating the  following situation.  can one leave 
 food  in oven after licht benching  , let's say at  200 degrees,  and the 
oven timer turns the oven off  about the time one comes home from shul  .
muttar?     blech needed?

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