Here’s a funny thing – in nearly 8 years of ownership, I’ve never ever rodded it, though I do check it regularly for flooding. Thing is, it’s always bone dry.
Now it has flooded at some stage in the past, as the ECM had a tide mark on it, was misbehaving, and had to be replaced by @marinabrian. But the plenum was dry then too…
But it’s never been even slightly wet in the time I’ve had it. And during all that time, I’ve lived in the countryside, with endless leaves, moths etc everywhere