Round vs Rain vs Box Gutter: Which Roll Forming Line Do You Need?

1. Selection principle

Choose the gutter roll forming line from the finished trough drawing, not from the vague word “gutter.” Inside this pack the documented families are:

• 6-inch half-round — semicircular trough host with a full FAQ baseline
• General rain gutter — eaves-trough baseline about 10–12 m/min
• Box / square gutter — category confirmed; machine ratings need a separate proposal

Industry buyer guides make the same first cut (half-round vs K-style/rain vs box) before discussing speed or power. Downspouts are never settled on this page.

2. Quick selection paths

3. Parameter map (do not cross-fill)

Applications reminder. All three serve roof-edge collection. High-capacity commercial box profiles, architectural half-rounds, and mainstream rain troughs are different buyer intents.

4. Boundaries

• Do not answer “gutter” with downpipe YX144 / YX76 / English down-take numbers.
• Do not use half-round or rain numbers as temporary box ratings.
• Do not treat specialty-pack indexes as a second conflicting parameter authority for the 6-inch half-round.
• Price and lead time remain out of scope.

5. Buyer FAQ

We only know the local market uses “square gutters.”

Route to box gutter + request a drawing. Do not auto-pick rain-gutter ratings.

Customer says K-style — which page?

Start with the rain-gutter N-entry, then confirm the exact cover geometry on the drawing.

Do we need both gutter and downpipe lines?

For a complete metal rainwater goods plant, usually yes — trough host plus pipe host (bender optional).

Is half-round always slower?

On the documented baselines, yes (about 3–8 vs about 10–12 m/min). That is a quotation fact, not a universal physical law for every market machine.