What is the fine-grained topic of the following text: The Flettner TCX-2™ (with Narrow Base) performs the same as a standard TCX-2 Roof Ventilator, but can be fitted to vehicle roofs with more narrowly spaced ribs, even with spacing as small as 108mm (4.25″). Only return the topic.
Flettner TCX-2™ (with Narrow Base) Roof Ventilator