# Damper flap DN 40 IDMAR APF040FAF3500E – round/rectangular duct fitting

**URL:** https://aio.lv/en/product--idmar-apf040faf3500e--11835745
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Ventilation Filters
**Manufacturer:** IDMAR
**Manufacturer code:** APF040FAF3500E
**EAN:** 5906489922251
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 55.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 45.86 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--idmar-apf040faf3500e--11835745

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

IDMAR DN 40 damper flap (model APF040FAF3500E) is a compact duct fitting for controlling airflow in ventilation systems. Designed for installation in round or rectangular ducts, it provides adjustable airflow regulation and shut-off capability for HVAC applications. Suitable for use in residential and commercial ventilation, air handling, and duct balancing tasks.

## Long description

IDMAR DN 40 damper flap APF040FAF3500E is a compact duct fitting designed for controlling airflow in ventilation systems. It is compatible with both round and rectangular ducts and provides adjustable regulation and shut-off capability for HVAC installations. The unit is intended for balancing air distribution, isolating sections of ductwork and fine-tuning supply or extract airflow in residential and commercial ventilation and air handling systems.
Advantages
The damper flap offers space-efficient construction and straightforward integration into existing ductwork. Its adjustable mechanism enables precise modulation of airflow, while the sealed closed position supports reliable shut-off when required. The product's compatibility with round and rectangular ducts reduces the need for additional adapters, and the design supports routine maintenance and inspection.
Suitable for
Balancing supply and extract air in residential ventilation systems
Zoning and isolating sections of commercial ductwork
Airflow regulation in air handling units and mechanical ventilation
Fine adjustment during commissioning and maintenance of HVAC systems
Key specifications
Nominal diameter: DN 40
Shape compatibility: round and rectangular duct installation
Function: adjustable damper flap with shut-off capability
Application area: ventilation, air handling, HVAC balancing
Construction: compact duct fitting suitable for confined spaces
How to use
Install the damper flap into the duct section selected for flow control, ensuring correct orientation for round or rectangular connections and secure mechanical fastening according to local installation practice. Adjust the flap position to obtain the required airflow by using the provided adjustment mechanism; verify balanced flow with anemometer readings or system design values. For shut-off, move the flap into the fully closed position and confirm sealing. Follow applicable ventilation and HVAC installation standards during mounting and commissioning.
Usage recommendations
Perform periodic inspections and cleaning to prevent dust buildup that could affect movement and sealing. Use appropriate tools for adjustment and avoid excessive force. Verify airflow settings after any system changes and during routine maintenance to maintain intended ventilation performance.

## FAQ

### How much does the Damper flap DN 40 IDMAR APF040FAF3500E cost, and is it available for purchase?

The price is 55.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 07.07.2026 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 IDMAR 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 IDMAR 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/11835745/67235492_large.webp