Decalu 88 Hidden

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Brand: Deceuninck
Lead time: up to 7 weeks Find out more

Guarantee included at purchase Find out more

Decalu 88 Hidden

For whom?

A window system characterized by a hidden sash. It provides very good thermal and acoustic insulation, while maintaining an extremely original appearance.

Constructional features

a system with a concealed wing,
Installation depth 88 mm,
two gaskets,
gaskets integrated into profiles,
Uw = 0.9 W/m2K (with a two-chamber package),
Uf from 0.81 W/m2K,
maximum glazing thickness 71 mm,
the standard glazing package is 4th/16/4/16/4th*.
mobile post with a minimum width of 111.5 mm,
high watertightness parameters – 2400 Pa,
dehydration down the frame,
invisible drainage of the horizontal post,
Patented drainage groove protection,
invisible line of gaskets,
system parameters confirmed by a certificate from the Building Research Institute.

DECALU 88 HIDDEN – the so-called “hidden wing” system contains all the features of the basic DECALU 88 STANDARD solution, and at the same time provides optimal visuals for this type of solutions. An additional advantage of the DECALU 88 HIDDEN system is the possibility to glaze all glass thicknesses with glazing clips used in the basic version without the need to change the sash profiles. The movable post for “hidden wing” solutions in the minimum version has a visual width of 111 mm. In the system, fixed post solutions will be available for the following units: wing-sash, wing-sash – permanent glazing, permanent glazing – permanent glazing.


A system using patented solutions with the so-called “hidden wing”. The sash – fixed, sash – sash, fixed-glazing units are designed in the same external plane, i.e. fixed and openable (with sash) units in this solution have the same appearance.

The appearance of windows based on the Decalu 88 Hidden system is appreciated by architects. It looks particularly good in office buildings, but it will also work well in residential buildings.

In traditional systems, visually visible and widening window sashes often interfere with the elevation divided by vertical and horizontal lines of profiles, which is why in such cases the so-called hidden sashes are used. Decalu 88 Hidden windows look very interesting in buildings with external vertical and horizontal rustications or mounted in rectangular or square, external prefabricated panels.

The movable post for Decalu 88 Hidden solutions in the minimum version has a width of 111.5mm and a frame height of 83mm (for permanent glazing or openable quarters). The depth of the system is 88mm.


What distinguishes the windows based on the Decalu 88 Hidden system from others is undoubtedly an extremely aesthetic appearance. Both from the outside and after opening the sash, the window looks very good. All gaskets in the windows are flat and practically invisible. Moreover, the system manufacturer has obtained the lowest frame and sash assembly on the market – only 83 mm. The smallest width of the movable centre post was also obtained – 111.5 mm.

What does this mean?

First of all, the fact that the window has a larger glazed area, and thus better illuminates the rooms.

The aesthetics of the window are also enhanced by hidden hinges. The application of this solution allowed not only to get rid of unnecessary, visible elements, but also to maintain the continuity of the gaskets, and thus the tightness of the window. The only visible element of the window fitting is the handle, which can be painted in the colour of the window. All details such as the shape and appearance of the drainage cap, the colour of the fittings, the visual flatness of the gaskets have been taken care of here.

In order to give an individual and even more interesting look to the woodwork, it is worth considering the choice of its colour. The windows in the Decalu 88 Hidden system are available in the entire RAL palette and wood-like colours. We also offer anodized joinery.



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How it works

Asking for a quote

Press ‘Get a quote’ button and submit your enquiry with the chosen joinery parameters (dimensions, quality, colours, accessories).

Receiving the quote

Our sales team will return to you with the purchase quote on joinery as well as delivery/installation costs and lead time.


Our employee will go through all the information included in the offer together with you.

Agreement & Payment

It is the stage where we confirm the contract and you make the payment.


It’s the time it takes to produce your ordered joinery.


This is the shipment period for your ordered products.


If you’re interested in our installation services, we agree on the dates individually.

Frequently asked questions

How do I get a quote?

First of all,  you should send us your enquiry where you specify your chosen joinery parameters, dimensions and qualities.

In order to prepare a quote for you, we need the following details:

  • Model window/door (aluminium/uPVC) – [any specific U-value is required?]
  • Width x Height [mm]
  • Colour from internal/external side
  • Glazing: double/triple
  • Eircode (so we can check delivery cost)
  • Contact details, email address, phone number

In case you want the quote for installation services as well, let us know and specify whether you are interested in a new project or windows replacement.

Next, we will provide the personalised quote for the purchase of joinery together with installation costs, delivery and lead-time.

Please send all the information and enquiries about our offer to the following e-mail address:

Do you deliver & install joinery?

We deliver joinery to Ireland every week. At the moment, we offer installation services only in Ireland.

Our offer includes:

  • Product
  • Delivery
  • Installation (Ireland) + after-sales service
  • You receive a 5-year guarantee on Windows/doors (10 years for VELUX) and 2 years for the fitting.

We do not have any showroom in your country. All our joinery is sent to customers directly from Poland.
Our Company is based in Warsaw (Poland) and we also have a local sales point and warehouse in Ostrołęka, Poland.
All joinery is produced by Polish producers.

What are the delivery costs?

The cost of each delivery is calculated individually. The cost of delivery depends on the weight and size of pallets and their number.

Please send all enquiries about our offer to the following e-mail address:


Do you have a price list?

We are selling complex products, tailored services and our customers often require a special solution. That’s why each of our products is personalised and we do not have the standard price list. Every product is quoted according to individual customer needs.

Please send all enquiries about our offer to the following e-mail address:

How does the payment for your service look like?

There are two payment options for our customers.

A) You can pay in two instalments:

  • 50% when you accept the order
  • another 50% before the dispatch of the goods.

B) You can pay full (100% of the amount) in advance.*

*then we give you 2% discount

We only accept payments via bank transfer.

What is the warrantee/guarantee on your products?

All windows  and doors purchased at FENBRO have a following full guarantee:

  • 5 years for all our products

  • 10 years for all VELUX products

  • 2 years for the installation (with service provided by us)

In case of each sale, you get a sales contract together with an invoice. We always archive all invoices for 5 years as evidence of purchase.

Guarantee and complaints:

In case of any complaint, we will ask for photos and a description of what happened (preferably by an email). We are sending new products as fast as we can and in the meantime, we are taking care of the complaint. The typical length of time for complaint resolution is from 3 up to 4 weeks . You will get the spare parts within 7 -14 days. 

Please remember that the transport also is fully insured so everything is secured at all stages. For the delivery, you get a CMR document. It is a confirmation of delivery a proof that the products were received in good condition. You have 48 hours to check the conditions of your order. 

Depending on the type of the issue, we are sending spare parts, new products for replacement, or we refund the money.


Guarantee and DIY installation:

The guarantee is valid even if the window installation is carried out by our clients themselves or by an external company. The most important thing is that the installation is carried out in an artful manner and according to the installation instructions for the window.

Additionally, we offer support after the guarantee period is over. It means that if something happens with your joinery afterwards, we can get you all the necessary spare parts, ready-made products and tools to help you solve the issue (the service is chargeable at the end of the guarantee period). 

Please note that if you choose your own fitter, you are responsible for providing them with correct measurements of the openings as well as products dimensions. We cannot be held responsible for any irregularities in this regard.