When to Use D27
D27 is common on Festool sanders and handheld tools where hose flexibility matters. On tools explicitly compatible with 27/36 mm, D27 can provide a lighter and more maneuverable setup.
When to Use D36
D36 provides a larger cross-section and is better suited to higher chip volumes when the tool supports it. Festool specifically highlights a 36 mm hose for improved extraction on the KAPEX.
Example: OF 1400
The current OF 1400 specification lists a 27/36 mm dust-extraction connection. In the Finder, both sizes can therefore be offered as manufacturer-supported connections without forcing an imperial conversion.
Frequently Asked Questions
What hose size fits the Festool OF 1400?
Festool specifies a 27/36 mm dust-extraction connection.
Does D36 extract better than D27?
D36 has a larger cross-section and can handle higher chip volume when the tool and extractor support that size.
Should I convert D27 or D36 to inches?
Not to determine fit. Use the intended Festool connection system or an adapter with verified real dimensions.
Technical Sources
The sizes and part references in this guide are based on the following official pages: Festool OF 1400 Festool KAPEX KS 120.
Disconnect the machine before measuring or installing a fitting. Check the manufacturer manual, keep guards in place and never force a connector whose geometry does not match.