I had the same thing, the grill would whistle when it rained. I was still under warranty, so I called Thor and told CW to also call Thor. Thor sent the grill to CW and they replaced it. The new grill is the honeycomb shape holes. You may have to follow up withThor to make sure that CW actually calls them.
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Dave, U.S.A.F. (Ret)
2019 Fleetwood Discovery LXE 40M (Big D)
2016 Ford Focus, flat tow
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