The answer to 'ridge vent warranty' is that the warranty on a ridge vent can vary, but most manufacturers offer a 20-30 year limited warranty on their ridge vents. This covers defects in materials and workmanship, but does not cover issues caused by improper installation or normal wear and tear. The warranty typically applies to the ridge vent itself, not the entire roof system.
It's important to follow the manufacturer's installation instructions carefully and use a qualified roofing contractor to ensure the ridge vent is properly installed and sealed. This will help maximize the lifespan of the ridge vent and ensure the warranty remains valid.