Frequently asked questions
If you can’t find the answer you’re looking for below, please get in touch and we’ll answer your questions.
Are Rationel windows Secured by Design certified?
Rationel windows and doors have been tested and marked in compliance with several national and European standards, including Secured by Design. To view our certificate click here. Also, if you want to learn more visit our Secure By Design page. Alternatively, you can visit the Secure By Design page and see our certified products.
Are you FENSA certified?
Rationel is a supply-only company so is not FENSA certified. You would need to get a FENSA certificate from your local building control authority.
FENSA stands for the Fenestration Self-Assessment Scheme. This is a scheme set up to ensure that all windows comply with building regulations. Enables window installers to certify that windows comply without the need for a local authority inspection.
Are your products PassivHaus certified?
While our products are not PassivHaus certified, they are a high performing and energy efficient, and have been used on a number of PassivHaus projects.
Can I have a catflap in my door?
We cannot supply a door with a catflap factory fitted. Any amendments made to the door may invalidate the warranty of your product.
- Can I order samples?
Do you have a showroom?
We have a showroom at our Bicester office – please contact us to make an appointment. Alternatively, email us at email@example.com, provide us with your project details so we can refer you to a suitable distributor with showroom near you.
Do you offer standard sized stock windows?
We offer bespoke sized units within our min/max manufacturing sizes. We do not hold any stock items.
Do you provide a site measure survey service?
As Rationel are a supply-only company, we do not offer this service. We do however have a network of approved distributors who can offer this service at an additional cost.
Do you provide installation?
As Rationel are a supply-only company, we do not offer this service. We do however have a network of approved installers who can offer this service.
Do you supply curtain walling?
Due to Rationel products not being CWCT certified (which is an air permeability, weathertightness, wind resistance and impact mandatory test), we are unable to supply curtain walling.
How do I find the ORDER/POSITION number from the product?
Please see our Order Spares page to see where to find these numbers.
- How do I install Rationel windows & doors?
How do I order spare or replacement parts?
Please see our Order Spares page.
How do I remove labels and glue from the glass?
Glass labels on new windows can be removed by soaking the labels in water. Any label residue or glue left on the glass can be removed by gently applying ceramic hob cleaner.
I have a problem with your product. Who do I contact?
If you have an issue with your product, please contact our After Sales team who will be able to assist you.
Is the aluminium on your aluminium-clad windows a marine grade?
Yes. You can find us on the Qualicoat website if you search for Dovista or filter on Poland:
Should I be worried about condensation on the external panes of my windows?
If you have condensation on the outer side of your window glass, this is actually proof that your window is very energy efficient, and that it is functioning properly.
During colder nights, you may find that the outer surface of your low-energy pane is colder than the air outside. This results in condensation on the glass surface. However, this dew will disappear when the air temperature rises during the day.
Condensation between the two pieces of glass is a sign that the sealed glass unit is punctured and should be replaced. If you have condensation on the internal side of the glass, this means you will need to ventilate the room, as this is often a sign of relatively high indoor humidity. You should look to reduce this in order to prevent rot, moisture damage and a poor indoor climate.
What information do you require to provide a quotation?
Where possible please provide a full drawing package to include elevations, floor plans, window/door schedules and any specification information.
If you are a self builder click here to learn more.
If you are a housebuilder click here to learn more.
If you are interested in commercial projects click here.
What is the equivalent area of Rationel trickle vents?
When tested through window/door frame section, the equivalent area achieved is 2224mm2. When tested through a generic board, the equivalent area achieved is 3786mm2. This figure can be applied all current Rationel window systems. Testing has been carried out according to EN13414-1.
What is the lead time for receiving a quotation?
2-3 weeks. Please send your request with supporting drawings to firstname.lastname@example.org
What is the lead time for windows and doors?
The lead time depends on the requirements of your project. As standard, we aim to achieve a lead time of 8-10 weeks from final sign-off.
What is the product warranty on Rationel windows and doors?
We have a 5 year warranty on our timber products, and a 10 year warranty on our aluminium clad products. Please see our warranty page for more information.
- Where can I view your products?