Grey 90° rectangular to round elbow adapter standing on its round end, with the rectangular end pointing to the left

Hose and pipe adapters

90° rectangular to round elbow adapter

Joins a rectangular duct, port or opening to a round hose or pipe at a right angle, as a reducer when the sizes differ. The rectangular end is set by width, height and corner radius, the round end by diameter, each end male or female.

Specifications

Product code	QRF90
Rectangular end, width and height	20–200 mm
Round end, diameter	20–200 mm
Corner radius of the rectangular end	0–110 mm, at most half the shorter side
Bend angle	90°
Length of each end	50 mm
Wall thickness	2 mm
Tolerance	±0.3%, lower limit ±0.15 mm
Material	ASA
Max. working temperature	95 °C
Colour	Grey

Configure

Set the dimensions and preview the generated part.
Ships within 3 working days.

The 90° rectangular to round elbow adapter joining a rectangular duct to a flexible hose at a right angle — The rectangular end sits in a rectangular duct. A flexible hose is pushed over the round end, which turns the run up by 90°.

01 / Use

For dust extraction
and ventilation

Connects a rectangular dust port, duct or cut-out to a round vacuum hose or pipe where the run turns by 90°, at normal air pressure. Printed in ASA, which keeps its shape up to 95 °C and its strength outdoors. Not for liquids, gas, sparks or pressurised systems.

Cross-section of a pipe pushed into the tapered round end of the 90° elbow adapter up to the stopper — Section through the round female end. The pipe is pushed into the tapered bore up to the stopper.

02 / Fit

A millimetre off
still fits

Each end tapers from one millimetre over the sizes you enter to one millimetre under them, width and height on the rectangular end and diameter on the round one, so the joint tightens as the two parts push together and seats where the sizes meet. A stopper sets the depth. A rigid pipe or hose end needs no tape or clamp, and a measurement a millimetre off either way still grips.

03 / Reprint

One reprint
if it doesn’t fit

If a size you entered was wrong, contact us within 30 days of delivery and we print the adapter to the corrected dimensions for free and you pay only the delivery. You keep the first part.

Use and safety instructions: Flantex 90° rectangular to round elbow adapters

Manufacturer: Flantex VCC, 620 Arch. Bogdan Tomalevski St., bl. 620, entr. A, fl. 5, apt. 29, Mladost 4, 1715 Sofia, nikolay@flantex.com
Product: 90° rectangular to round elbow adapter for ducts, hoses and pipes, made to order
Identification number: on the part or its label, and on the delivery note in the parcel
Material: ASA, as stated on the delivery note and in the order confirmation

Intended use

Connecting a rectangular duct, port or opening to a round hose or pipe at a right angle, in workshop dust collection and household ventilation, at normal atmospheric pressure.

Limits: do not use the part

in pressurised systems, or under vacuum stronger than a regular vacuum cleaner or dust collector;
for gas, fuel, chemicals or drinking water, or in contact with food;
where air or surface temperature exceeds the maximum working temperature of the part's material in the table below, e.g. near heaters, stoves or exhaust gases;
for extracting hot particles, sparks or embers;
as a load-bearing or structural element.

Temperature limits by material:

Material	Max. working temperature	Outdoors (UV)
ASA	95 °C	suitable

Fitting

Check that the part matches the rectangular opening and the hose or pipe and that a 90° turn suits the run before fitting.
Push the hose or pipe fully on.
In dust collection systems, ground the system according to its manufacturer's instructions. Plastic parts do not dissipate static electricity.

Care and inspection

Check regularly for cracks, deformation and looseness. Replace the part if damaged. Clean with a damp cloth, no solvents.

Disposal

Dispose of the part as plastic waste according to local rules. Sort the packaging separately.

Questions and incident reports

In case of an incident or a suspected hazard, contact us immediately at nikolay@flantex.com, quoting the identification number.

Version 1, 23 October 2026

Use and safety instructions (PDF)