This model started as a simple round-to-round duct adapter, but it quickly grew into something more flexible once I ran into real-world ports that weren’t centered or round. Many tools, enclosures, and DIY shrouds use rectangular openings that don’t line up neatly with standard hose sizes, and I also needed a window vent solution that did not currently exist. Everything is adjustable so you can dial it in for your setup instead of forcing your setup to match the model.