In addition, if you ever remove them the holes are on the side lip of the roof vent and will have no effect on operation or water-tightness of the existing vent.
Advantages: They can be open during a rainstorm or when unoccupied for ventilation. Many have provisions for easily hinging one side for ease of cleaning.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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