PRO3D PRODUCTION
VELUX Window Filler – Extension Piece for VELUX AC Window Adapter
Price in EUR. Shipping is calculated in the cart.
Made to order: 3–5 working days.
Shipping to Slovenia for 1 item: 9,00 €. Transit: 1–2 business days after dispatch.
Shipping for other countries and multiple items is calculated in the cart. Add the stated production time to the transit time.
Standard products have a 14-day withdrawal period; the buyer pays return postage. Personalised text and custom sizes are exceptions. Return policy
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About this product
Designed specifically for use with my VELUX Window AC Adapter – Designed Specifically for Compatible VELUX Roof Windows.
Find the matching product in the AC adapter category in our store.
This filler piece closes the remaining opening in your VELUX roof window after installing the AC adapter, helping reduce warm air entering the room and improving the efficiency of your portable air conditioner.
Unlike universal solutions, this filler is designed to fit directly into the VELUX window profile used by compatible VELUX roof windows.
🆕 New Version (Released July 6, 2026)
On July 6, 2026, a new version of this adapter was introduced with an improved internal design that allows significantly better airflow, helping your portable air conditioner operate more efficiently.
At the same time, the matching VELUX filler panel was also redesigned to be fully compatible with the new adapter.
If you specifically prefer the previous adapter version, please send me a message before ordering and I will do my best to accommodate your request.
⚠️ This listing is for the filler piece only. The AC adapter is sold separately in my shop.
If you do not have a compatible VELUX window, please check my shop for universal AC window adapters designed for other roof windows.
How It Works
The AC adapter occupies part of the window opening.
The filler is installed next to the adapter and fills the remaining gap, creating a cleaner installation and helping reduce unwanted airflow from outside.
The filler is designed to match the same VELUX profile as the adapter and can be installed without modifications to the window.
Before Ordering
Please measure the internal width shown in the product images.
This is the distance between the two side profiles where the adapter and filler will be installed.
To determine the required filler length:
Required filler length
Example
VELUX GGU MK08 window Internal opening width: 695 mm AC Adapter width: 370 mm 695 mm − 370 mm = 325 mm
For this window and adapter combination, I recommend ordering the 320 mm filler size.
A slightly smaller filler is usually easier to install while still providing excellent coverage of the remaining opening.
Available Lengths
Standard lengths are available through the dropdown menu.
Maximum length of a single filler piece is 360 mm.
If you require a longer filler, simply order multiple pieces.
If you need a specific custom length, select the Custom Dimension option.
Please note:
⚠️ Maximum custom length in one piece is 360 mm.
Compatible Windows
Designed for compatible VELUX roof windows using the same lower profile as the matching AC adapter.
Please verify your window dimensions before ordering.
Material
✅ High-quality PETG plastic ✅ Heat resistant ✅ UV resistant ✅ Durable and lightweight
Each filler is manufactured using 3D printing technology.
Minor cosmetic layer lines or surface marks may be visible and are normal for 3D printed products.
Package Includes
✔ 1× VELUX Window Filler
❌ AC Adapter not included ❌ Air conditioner hose not included
Product Safety Information -For home use only -Not a toy -Keep away from open flames and excessive heat sources -Not suitable for children under 3 years -Contains small parts that may present a choking hazard -Inspect before use and discontinue use if damaged
The design may be continuously improved and can differ slightly from product photos.