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Distance of 5 cm/2inch from the side of the riser to the bell

 
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Is it ok to have a distance of just 2 inches/5 cm from the riser to the interior side of the bell in a batch box. heater?I am not talking about the top of the bell which should have a distance of 30 cm from the top of the riser.
 
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Location: Upstate NY, zone 5
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As long as there is plenty of free airspace elsewhere, I don't think a 2" gap on one side would be a problem.
 
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