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Distance from primary air input and floor located 'P' channel?

 
pollinator
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What is the ideal distance between the primary air input and a floor located 'P' channel in a batch box firebox?

Thanks as always for any help.
 
gardener
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Location: +52° 1' 47.40", +4° 22' 57.80"
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Mine is a 150 mil system and is endlessly tested. The distance between the air inlet and the start of the floor channel is just over 50 mm. I don't know what the ideal distance would be, provided there's one. But the system as it is works without a hitch, again and again.
 
John Harrison
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Thanks for the quick reply Peter. I'll use your tried and tested 50mm distance.
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