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

**URL:** https://aio.lv/en/product--awenta-a-ko100-29--11947150
**Data updated:** 2026-03-11 13:42 (EET)
**Category:** Ventilation Filters
**Manufacturer:** AWENTA
**Manufacturer code:** A-KO100-29
**EAN:** 5905033296268
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--awenta-a-ko100-29--11947150

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

AWENTA KO100-29 is a duct adaptor converting a 100 mm round ventilation duct to a 90 mm square duct. Designed for HVAC and residential ventilation systems, it provides a compact transition between different duct cross-sections. The adaptor facilitates connection of round fans, pipes or fittings to square ducts, supporting air flow continuity during installation or retrofit work.

## Long description

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.

## FAQ

### How much does the AWENTA KO100-29 100 mm round to 90 mm square adaptor cost, and is it available for purchase?

The price is 5.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All AWENTA products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized AWENTA service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11947150/67390654_large.webp