The Blum AVENTOS HF 20F3900.01 telescopic-arm set contains two symmetrical arms for legacy AVENTOS HF bi-fold lift systems with cabinet heights from 760–1040mm. The arms connect the selected lift mechanisms to the bi-fold front and extend as the two front panels move upward and fold together.

The 760–1040mm range identifies the cabinet height used for correct arm selection; it is not the arm's physical length, door width or weight capacity. For an asymmetrical bi-fold front, select the arm from Blum's theoretical cabinet-height calculation.

For legacy AVENTOS HF applications

Part 20F3900.01 belongs to the original AVENTOS HF programme for standard BLUMOTION or SERVO-DRIVE applications. HF top uses different 22F-series arms, including an 840–1200mm version; do not present the systems as interchangeable.

Verified set contents

• 2 × symmetrical AVENTOS HF telescopic arms
• Blum set part number: 20F3900.01

Lift mechanisms, hinges, mounting plates, cover caps and SERVO-DRIVE components are not part of Blum's listed telescopic-arm set contents. Do not assume that any additional components are supplied.

Select by cabinet height

Use 20F3900.01 for cabinet heights of 760–1040mm. Other legacy HF ranges use 20F3200.01 for 480–570mm, 20F3500.01 for 560–710mm and 20F3800.01 for 700–900mm. Ranges overlap intentionally; follow Blum's planning result.

Arm selection does not determine the full application. Calculate mechanism power factor from cabinet height and combined front weight including handles, then check front proportions, hinges and clearances in Blum planning information.

Key features

• Genuine Blum legacy AVENTOS HF telescopic-arm set
• Blum part number: 20F3900.01
• Stock code: HI20F390
• Verified cabinet-height range: 760–1040mm
• Two symmetrical telescopic arms
• For bi-fold lift fronts
• Suitable for planned standard or SERVO-DRIVE AVENTOS HF systems
• For symmetrical or correctly calculated asymmetrical front layouts
• Not compatible with AVENTOS HF top unless Blum planning explicitly states otherwise

Product details

What else is required?

A complete installation needs the correct HF mechanisms, hinges, arm plates or adapters, cover caps and front fixings. SERVO-DRIVE electrical parts are separate.

For wooden fronts and wide aluminium frames, Blum lists compatible 0mm arm mounting plates such as 175H3100 screw-on. Narrow aluminium-frame applications use the specified left/right CLIP adapter plate arrangement. Confirm the complete front type before ordering.

Installation guidance

1. Confirm the application is legacy AVENTOS HF, not HF top.
2. Verify the 760–1040mm cabinet height or calculated theoretical height.
3. Calculate power factor and select compatible mechanisms, hinges, plates and caps.
4. Install both symmetrical arms using current Blum drilling and assembly information.
5. Adjust the full system and check alignment, folding movement, clearances and secure engagement.

Questions and answers

Does 760–1040mm describe the arm's length?

No. It is the cabinet-height selection range. For asymmetrical fronts, use Blum's theoretical cabinet-height method.

How many arms are supplied?

Blum lists 20F3900.01 as a set of two symmetrical telescopic arms.

Is this an AVENTOS HF top arm set?

No. It belongs to the original AVENTOS HF system. HF top uses 22F-series arms with different ranges and system components.

Does the set include lift mechanisms or mounting plates?

Not in Blum's listed contents. The mechanisms, hinge set, plates, cover caps and any SERVO-DRIVE parts are selected separately.

Can it be used with SERVO-DRIVE?

Yes, 20F3900.01 appears in Blum's legacy HF planning for standard and SERVO-DRIVE systems. All electrical components are separate.

Browse the Blum AVENTOS HF and HF top range to compare arms and components.