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For your 2001 Chinook Glacier I recommend the MaxxAir Standard RV and Trailer Roof Vent Cover # MA00-933069 which will install over your two existing roof vents allowing you to open your vents in any weather conditions, and the included bug screen will keep bugs out when the vent is open.
I included a video of the MaxxAir # MA00-933069 for you to take a look at. view full answer...
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