Industry dictionary

In our industry dictionary we define some basic concepts connected with window and door production. We hope that this will help you to make the absolute best choice for your needs.

Handle rotation lock –a mechanism ensuring the correct use of the window, blocking the tilt function when the window is open.  This prevents the sash from falling out of the upper hinge which could be dangerous, especially with large windows.

Anti-burglary pin –This is a special pin which blocks the sash in the frame making it less susceptible to break-ins.  This pin together with special plates in the frame form ‘safe points’.  The higher the number of these points, the safer the window.

Microventilation –A mechanism allowing fresh air flow even when the window is closed. Turning the handle 45 degrees from horizontal a small gap is created (approx. 3 mm) between the frame and sash ensuring air flow.  Due to a special plate, the sash remains in this microventilation position until the handle is turned again. Especially useful in rooms with high humidity.

Window stop – This mechanism keeps the window open in the desired position thanks to a friction brake. By reducing the opening angle to 90 degrees, we prevent the window from hitting against nearby walls or furniture.

Graduated tilting- thanks to the MSL mechanism, the angle of tilt of a window can be regulated. Instead of just one tilting position, many different angles are possible simply by turning the handle.  At the same time the window is protected against slamming closed.

Balcony latch – This prevents the balcony door from hitting against the frame. After going on the balcony we can close the door by pulling a special handle and the latch keeps the door closed.  The door can be opened simply by applying a little pressure from the outside. An ideal solution for balconies and terraces.

Chambers in PVC profiles– The chambered structure of PVC profiles not only improves their thermo insulation properties, but also allows for them to fit inside steel bracing sections, strengthening the construction.  In theory, the more chambers, the better, because heat losses will be lower.  Before making a final decision however, the customer should ask the producer/dealer for a cost calculation based on windows of varying numbers of chambers.  The number of chambers is also related to the width of the window.  In a five-chamber profile, the width of the sash should be at least 70 mm, in a six-chamber profile, at least 80 mm.  These parameters ensure optimal statics and thermo insulation

U and K symbols –The U and K symbols indicate the heat-transfer coefficient.  The lower the value, the better the thermal insulation.

Window reinforcements-  PVC has many advantages, but in its pure form does not ensure enough rigidity for a window to properly work.  It is necessary to reinforce it with invisible sections which are fitted inside a profile.  These sections should be made of galvanized sheet steel with specific parameters, adequate thickness, and correctly profiled. This is especially important in the case of wide or high sashes. Without these reinforcements, the load carried by profiles might eventually cause damage to the window and limit its use.                                                                                               

Seals-  Seals decide how tightly a window can be sealed so they’re extremely valuable in window construction.  In PVC windows they are placed both near the pane and where the sash meets the frame. Their task is to separate the ‘wet zone’ from the ‘dry zone’ where fittingsare most often installed.  Water is removed from the ‘wet zone’ by drainage holes placed in the lower, external part of the frame.

Seals must be made of durable materials which keep their physical properties over time.  These materials include silicones, ethyl-propylene rubber (EPDM) and thermoplastic elastomers (TPE).  Seals should fully perform their role for 5-10 years after which they can be replaced by new ones if necessary.

Passive and energy-efficient windows- Passive buildings are characterized by the minimalization of heat loss and maximizing energy gains (such as obtaining energy from the environment). By rule, every external wall, door and window must have an exceptionally low heat loss co-efficient.  In passive and low-energy houses solutions protecting from heat loss must be implemented which are not used in standard builing design.

More information can be found in the publication “Passive and energy-efficient houses” in the link below.

Domy nisko-energetyczne i pasywne

Lock Fittings- The functionality and characterisitcs of windows is decided in large part by an invisible mechanism hidden between the sash and frame, the lock fitting. Its basic function is opening, closing and tilting the window, but there are many other functions which have a direct influence on the comfort of use. The basic classification is divided into groups: connecting, closing, securing, and tilting-covering, depending on their use.

OKNO-POL Kraków Guarantee

All windows and doors produced and installed by our firm carry a 5-year guarantee.

What to ask the producer/salesperson of your windows?

  • Do the goods on offer have all the applicable  approvals and certificates?
  • Does the company offer service both during and after the warranty and what are the conditions of the warranty?
  • How long has the company been on the market?
  • How much experience does the installation team have?
  • Has the installation team received praise and positive feedback for its work?
  • How long has the present installation team been working together?

What to remember when buying windows?

  • Correctly choosing the window dimensions in relation to the dimensions of the existing or planned openings
  • Replacing windows should be performed by a contractor who guarantees  their proper installation and sealing (a three-layer system is the best)
  • Ensure that the contractor provides instructions
  • Ensure that the contractor guarantees the work being done