I still remember reading on here shortly after getting the ZTT about the need to check and rod through the plenum drains and thinking I had better do that.
I was amazed to find a couple of inches of water and loads of dead leaves. The water cascading out onto the drive after I poked through the crud with a length of grey flexible 1/2” water pipe was a sobering sight.
Regular checks now show that my homemade plastic mesh leaf guards work well.
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