As is apparent from the power output (continuous power rating from specifications at the bottom of this document), the vented or units model number starting with V have a couple of advantages:

• Rated for a higher continuous output
• Longer AC overload capacity
• Higher battery charger output
• Suitable in a hotter climate

This is because they have a fan that's cooling the chassis and power electronics directly to the outside air. The electronics can run cooler and more efficiently.

However, if the inverter is installed in a humid or corrosive area, the sealed unit is the way to go. The sealed FXR unit will have generally lower output:

• The continuous power rating is lower
• Reduced AC overload capacity is reduced for durations over 5 seconds
• Reduced battery charger output

But it will have a longer life since the power electronics are not directly exposed to the atmosphere. Both units are pretty much identical otherwise.