FAQ – Kierstandhouder | Kierr
1Why should I choose the gap holder by Kierr?
When you're looking for an easy way to put your windows or doors ajar without drilling or screwing.

After all, you do not want to damage your doors or window frames made of wood, plastic or aluminium. Maybe you're not even allowed to drill or screw because you have a rental property, for example.

Or you don't like to have a permanent solution, a hook in the frame for example, to put your doors and windows ajar. The gap holder by Kierr is easy in use and suitable for almost every door and window!
2I have Questions about the Kierr
If you have any question please let us know and send an Email to info@kierr.nl If you have doubts if the Kierr wil fitt on your window or door, send us some photo's (side of window/door and frame. We can always give you tips how to place the perfect Kierr for you.
3What's the price?
The prices of the Kierr gap holder vary between € 24,95 and € 39,95 depending on size and type.
4What is the delivery time?
The shipment is between 3 until 5 working days after receipt of payment.
5Can I really use it without drilling or screwing?
Yes, that is what's unique about the gap holder by Kierr. Also, the Kierr provides a steady and firm gap because of the rubber protection on the clips of the gap holder. Therefore it also makes sure that it doesn't damage your (window) frames.
6Is the Kierr easy to use for plastic windows and doors?
The Kierr is just a perfect and unique product to use for windows and doors made of plastic. As you might know, one may not drill or screw into a plastic (window) frame because it damages the inside of the frame. The Kierr has therefore been developed so that even without drilling or screwing you can easily put your door or window ajar.
7What are the costs of the delivery service?
For the delivery of the gap holders we charge in The Netherlands € 6.95 and in other countries € 11,75, regardless the amount of products that are ordered.
8What is the minimum and maximum opening of the Kierr Classic and Flex?
The minimum opening of the regulier Kierr Classic/Flex 100 is about 2 cm. But this depends on the frame of your window or door.

The minimum opening of the Kierr Classic/Flex 200 is approximately 5 cm. This also depends on the frame of your window or door.

The minimum opening of the Kierr Classic/Flex 300 is approximately 10 cm. This also depends on the frame of your window or door.

The maximum opening of the Kierr Classic/Flex 100 is about 10 cm. But this depends on the frame of your window or door.

The maximum opening of the Kierr Classic/Flex 200 s approximately 35 cm. This also depends on the frame of your window or door.

The maximum opening of the Kierr Classic/Flex 300 is approximately 50 cm. This also depends on the frame of your window or do
9What kind of material is the gap holder made of?
The gap holder by Kierr Classic is made of high quality stainless steel. The Kierr Flex is made from aluminium and have all a rubber layer of 2 mm. on the clips to protect the frame of the door or window. The Kierr Click is made als from alumium and has magnets self adhesive.
10Does the gap holder fit on every alulmium or plastic frame, door or window?
Basically, the gap holder should fit on every frame, door or window (made of wood, plastic or aluminium). The maximum width of the gap slightly depends on the frame itself. When you have beveled frames or rounded frames then you can choose the Kierr Flex 200 of Kierr Flex 300. They both have a bigger reach clamping
11Is the Kierr suitable as a burglary prevention?
No, the Kierr is not suitable to serve as a burglary prevention because it can be removed manually very easy. But of course, this is not what the gap holder by Kierr is meant for. It is meant to provide you with an easy solution to put your door or window ajar. A solution which is not permanent, so you can easily detach it and store it when you want to fully close the door or window.
12Do I have a guarantee on the gap holders by Kierr?
Yes, you have a one year warranty on the Kierr and Kierr XXL. Your invoice is also your guarantee certificate. Please contact us via our contact form on the website.
13Order business
If you want to order for your business and you do not have the possibility to pay with a credit card, it is possible to receive an invoice. After receiving the payment, the order will be sent to you. You can let us know via the contact form that you are interested. In the mail please let us know which type of Kierr you want to receive and the number. Also the company name and address where the order must be sent to.
14The Kierr on a tilting window
The Kierr can be placed on a tilting window to reduce the crack. See the specially developed Kierr Click 100 under the section tilt windows. This is perfect to let less wind and cold in or keep the heat outside.
15Returns
If you want to return the Kierr then please send at first an email. The cost and risk for the return are for yourself. Please put a note with your name and adres in the box. After receipt of the return will be notified within a few days the refund.
16 Test prints Kierr Aluminum
The Kierrs are regularly tested for quality. As a result, user tracks may be present on the aluminum version of the Kierr. This is caused by tightening the clamping blades and its small pressure points on the aluminum-guided rod.
17Risk: placing Kierr on windows that pop out.
The installation of the Kierr on outward opening windows is at your own risk. We definitely do not recommend this. Because you attach The Kierr by clamping, there is always the option that it can fall off. Please pay close attention to this.
18The edges of my frames are beveled / rounded. What is possible?
Are great option for when you have beveled or rounded frames are the Kierr Flex 200 or the Kierr Flex 300.
19Can the Kierr stay on my window or door (frame)?
The Kierr Click 100 and Click 200 are especially designed to stay on your door or window. They are attached with self-adhesive magnets. Of course you can always choose to take them off.
20Why are the Kierr Flex 200 and 300 provided with a hinge?
When you need to walk through the door very often it might come in handy that you do not need to remove the full gap holder. With these models you only have to loosen one part to enable you to walk through. Because of this, these models are very simple and easy to use.