Benno High Rail Plus Rack Add-On - Boost EVO 4-5 RemiDemi XL Black MFPN=W010-0396 As far as ventilation is

As far as ventilation is concerned

Pressure Relief Valves eliminate unwanted air pressure build up in the lower leg caused by variations in altitude or temperature

Measures bicycle chain wear accurately preventing expensive drivetrain damage

to push the boundaries of what we thought was possible on a gravel bike

Benno High Rail Plus Rack Add-On - Boost EVO 4-5 RemiDemi XL Black MFPN=W010-0396 As far as ventilation isThe Benno High Rail rack add on extends the usefulness of the Utility Rack to provide additional stability for bulkier loads or older children. Make sure that no parts of the body or clothing come near moving parts on the bicycle such as chain spokes tires or brakes