Sorry to hear but use it as an opportunity to upgrade the vent. Went with the non-powered Fantastic Vent when we removed the rooftop A/C for mini-split. Love that the smoke cover acts like a skylight and allows in some diffuse light. Standard 14"x14" opening.
Backing into camp spot at hermit fest & hit a limb which broke the roof vent as well as bent the metal piece. Bummer!!! Is the vent on 17b a standard one that is easily replaced @ rv repair shop?
You're not alone. I cracked mine when smashing ice on my roof.
Simple to replace. You don't need an RV repair shop. Undo a small tab and slide the new on in. I upgraded to a polycarbonate shatterproof one.