Heatilator GNDC 36 Nat. Is there a flame adjustment. Mine Very small.

I would like to know if there is a flame adjustment on the GNDC 36 Natural gas insert. The flame is slight and I don't see anywhere on the gas valve where there may be an adjustment.
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Steve,
The manual may be found here. http://hearthnhome.com/downloads/installManuals/34616.PDF Looks to me as if you should check the gas pressure and perhapd adjust the air.
Dave M.
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