Moe,
I choose the RV Refrigerator vent for a good reason. They fit "Between" the ribs, avoiding the leakage and roof distortion issue everyone has. And their design is "Self venting" and weather proof as well. The Venting areas are 5" x 24" ea. Thus giving a total vent of 10" x 48" without cutting through any ribs and without losing any of the roof rigid-ness the ribs were designed for. We all our reasons for what we choose. Of course this is just mine.....
And cheap too! $31 ea.
http://cgi.ebay.com/ebaymotors/NEW-Norcold-Refrigerator-Roof-Vent-RV-Camper-_W0QQcmdZViewItemQQitemZ370287004887QQptZMotorsQ5fRVQ5fTrailerQ5fCamperQ5fPartsQ5fAccessories
I choose the RV Refrigerator vent for a good reason. They fit "Between" the ribs, avoiding the leakage and roof distortion issue everyone has. And their design is "Self venting" and weather proof as well. The Venting areas are 5" x 24" ea. Thus giving a total vent of 10" x 48" without cutting through any ribs and without losing any of the roof rigid-ness the ribs were designed for. We all our reasons for what we choose. Of course this is just mine.....
And cheap too! $31 ea.
http://cgi.ebay.com/ebaymotors/NEW-Norcold-Refrigerator-Roof-Vent-RV-Camper-_W0QQcmdZViewItemQQitemZ370287004887QQptZMotorsQ5fRVQ5fTrailerQ5fCamperQ5fPartsQ5fAccessories