I've been busy camping, so the TT has an appointment tomorrow to replace all of the vents under warranty. In the interim, the clothespin trick mentioned earlier in this thread worked just fine.
2017 Cedar Creek 38CK Hathaway Edition
2015 Ford F-350 6.7 CC 4x4
Full-timing since 5/2/2016. Roam Sweet Home.
FROG Int'l Rallies: 2012, 2013, 2014, 2015, 2016