Others may differ, but I wouldn't install a cover on the Creat-a-Breeze in the head. The manufacturer recommends against it in the literature, saying it will decrease the effectiveness of the unit. I followed that guidance, and installed Maxxair II's on the remaining crank-up vents in the TT.
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