Easily installs using original mounting hardware. All fans are waterproof and dustproof. All fans (except Polaris fans) are typically 25% higher CFM than the stock fan. The Polaris fans are O.E.M. compatible in design and output. Less expensive than factory replacements with more performance. Mounts easily using original mounting hardware. All fans are waterproof and dustproof. All fans are typically 25% higher CFM than stock fan. Less expensive than factory replacements with more performance. Note: For Polaris models, fans are O.E.M. compatible in design and output.