What ducting systems is the AD857042 adapter duct suitable for?

It is suitable for flat duct and flat duct flex, and for round duct when used with a pipe connector. It is also suitable for use with aluflex pipe.

How is the adapter duct connected during installation?

The adapter duct is easy to connect via the flat duct connecting piece.

What is the size and shape of the AD857042 adapter duct?

It is an adapter duct with ⌀ 150 mm diameter, a 90° angle and a round–flat form.

Is the AD857042 designed to support efficient airflow?

Yes. It is aerodynamically optimised for minimised pressure losses and maximised flow rate.

Which flame and building material standards does the adapter duct meet?

It complies with the Needle Flame Test (IEC 60695-11-5), the V2 flammability class (UL94) and the B1 building material class (DIN 4102-1).

Product Information Sheet

Gaggenau Adaptor 90° bended, Round/Flat

SKU: AD857042

Woodalls 1053–1055 Finchley Road, London, NW11 7ES
+44 (0)208 455 3925 · [email protected] · www.woodalls.co.uk

Mon–Fri: 9:00am – 5:00pm | Sat–Sun: Closed

Printed 19 July 2026

Gaggenau AD857042 Adaptor 90° bended, Round/Flat

SKU: AD857042

Black Plastic B1

The Gaggenau AD857042 adapter duct is a ⌀ 150 mm, 90° round–flat installation accessory designed for use with flat duct, flat duct flex and round duct systems. It connects easily via a flat duct connecting piece and is aerodynamically optimised to minimise pressure losses and maximise flow rate. The adapter duct also complies with recognised flame and building material standards, supporting safe and efficient ventilation planning.

5 Year Warranty

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This Product Page

Product code	AD857042
Product type	Adapter duct
Diameter	⌀ 150 mm
Angle	90°
Form	Round–flat
Compatibility	Suitable for flat duct, flat duct flex, round duct (with pipe connector) and aluflex pipe
Connection method	Flat duct connecting piece
Aerodynamic design	Aerodynamically optimised for minimised pressure losses and maximised flow rate
Needle Flame Test	Complies with IEC 60695-11-5
Flammability class	V2 (according to UL94)
Building material class	B1 (DIN 4102-1)
Dimensions	Not stated in source

Delivery & Returns

Delivery

Free delivery to London addresses to ground floor only (service lift access accepted). Some appliances carry standard manufacturer delivery charges — confirmed at time of quotation. UK mainland delivery available for an additional charge. Lead times vary by make, model, and manufacturer availability.

Installation

We do not install appliances. We can recommend vetted fitters operating within London — payments are made directly with the fitter. Woodalls accepts no responsibility for installation work carried out by any third party.

Returns

14-day return window from the day after delivery. Items must be unused, uninstalled, and in original packaging. View our full returns policy →

Authorised Dealer

All products are supplied as an authorised Gaggenau dealer, with full manufacturer warranty. Established 1967.

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Gaggenau Adaptor 90° bended, Round/Flat

Gaggenau AD857042 Adaptor 90° bended, Round/Flat

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