Round-to-square duct adaptor AWENTA KO100-29 — 100 mm round to 90 mm square

AWENTA KO100-29 is a duct adaptor that converts a 100 mm round ventilation duct to a 90 mm square duct. Designed for HVAC and residential ventilation systems, this compact transition piece allows connection of round fans, pipes or fittings to square ducts while maintaining airflow continuity during installation or retrofit work. The adaptor's shape minimises turbulence at the junction and is intended for use where space constraints require a change of duct cross-section.

Advantages

The adaptor provides a simple mechanical transition between circular and square ducting without the need for custom fabrication. Its compact dimensions make it suitable for tight installations and reduce the amount of additional ductwork required. Constructed to fit standard ventilation elements, the piece supports stable airflow and reduces installation time compared with on-site modifications.

Suitable for

• Residential ventilation system installations and retrofits
• Connecting round fans or inline units to square ducts
• Limited-space mounting where a compact transition is needed
• HVAC maintenance tasks requiring quick cross-section conversion

Key specifications

• Input diameter: 100 mm round
• Output dimensions: 90 mm square cross-section
• Function: passive duct cross-section adaptor for air ventilation
• Application: indoor ventilation and HVAC systems
• Design: compact transition profile to minimise airflow disruption

How to use

Ensure that both the round duct and the square duct mating faces are clean and free of obstructions. Fit the 100 mm round end to the round duct or fan outlet and secure with an appropriate clamp or fastener suitable for the duct material. Align the 90 mm square end with the square duct and attach using screws, rivets or compatible sealing tape to maintain airtightness. Check connections for leaks and secure any flexible joints to prevent movement during operation.

Usage recommendations

Use appropriate sealing materials and mechanical fasteners to ensure airtight connections. Verify that the adaptor is compatible with the system's airflow direction and that the change in cross-section does not exceed the performance limits of connected equipment. For installations in damp or corrosive environments, select compatible fasteners and consider additional protection for the joint.