At UL’s in-house laboratory in Northbrook, Chicago, Illinois, we can test closures according to the American standards. Alternatively at the UL laboratory in Rosenheim, Germany. The test is very similar to the European one, it only differs in that at the end of the test, after 20 minutes, the hose stream test is applied, which is a full power hydrant jet that follows a certain pattern (a path) for a certain time. The door must not leave any open spaces from which the hose stream can be glimpsed afterwards, and the hose streams and door larches must be engaged at the end of the test.


The available classifications are:

  • 20-minutes without hose stream
  • 20-minutes with hose stream
  • 30-minutes with hose stream
  • 3/4-hour with hose stream 
  • 1-hour with hose stream
  • 1-1/2-hours with hose stream
  • 3-hours with hose stream 
  • 4-hours with hose stream


Normally, in the case of symmetrical constructions, only the exposed pull side (door opening towards the oven) is tested.

Should the hose stream fail in a door that has resisted fire for more than 20 minutes, the only possible classification is 20 minutes without hose stream.

This is an extremely demanding test for wooden doors in particular. We have the possibility to combine, in the same test if carried out at the Rosenheim laboratory, also the test according to the European standard EN 1634-1.

With the UL 10B standard, no positive pressure is applied (a little easier).

With the UL 10C standard, positive pressure is applied.

The CAN-S/104 standard is like UL 10C, but only doors that pass the Hose Stream are classified.


Within a door that is UL tested, accessories such as hinges, certain types of gaskets and under-door seals can also be tested and subsequently ‘listed’.

Door closers require an additional test (endurance according to UL228), locks on the other hand are normally tested within a metallic hollow door listed for up to 3 hours, so they are hardly suitable for testing in conjunction with the door itself.


Change hinges, locks, finishes, design. Sometimes this is possible without re-testing: you have to present the case to UL engineering and either a Minor Evaluation or a Major Evaluation may be instituted, which complements the UL File concerning the door. The difference lies in the cost, which is higher if Minor, Major or new test.


If the test is successful, which is regular for us, UL proceeds with the Follow Up Service, FUS, as you can see in the specific section of the website. by clicking here.(METTERE LINK CERTIFICAZIONE UL LISTING)


UL listed products can be found and searched in the UL database, IQ Prospector

UL is not the only laboratory that can carry out UL tests, but it is the only one that can list you in the UL IQ Prospector. There are also other organisations that can carry out a test according to the UL standard, they may list you in their own database (e.g. Intertek)


Products with an Intertek listing can be found and searched in the construction products database


UL is among the laboratories included in the Civil Defence lists of the Middle East, with the issuing of the CoC Certificate of Conformity for the specific country;  it is possible to market products in those areas. You can read more in the section dedicated to fire resistance Middle East


Eros Chemolli is a member of UL’s STP10 standardisation group, which discusses various UL safety standards:

  • UL 9, fire testing of window assemblies
  • UL 10A, coated fire doors
  • UL 10B, fire testing of doors
  • UL 10C, positive pressure fire testing of doors
  • UL 10D, fire testing of fire protective curtains
  • UL 14B, sliding fire door fittings
  • UL 14C, hardware for hinged fire doors

Modifications to UL10B/C have recently been proposed by us, based on experience.


When it comes to testing, we provide our experience and our KNOW-HOW.

As specialists, we offer comprehensive advice during all stages of laboratory testing, from design to documentation of results.


Listening is the most important phase of our interaction: we want you to develop a product that is the sum of your identity and needs.

First, we try to understand your real needs, the channels and markets you want to measure yourself against.

Then we show you how the testing and certification process takes place: we need to engage with you, to fully grasp your point of view. Then we develop a proposal that respects – compatibly with the required performance – your product lines, your production lines and, as far as possible, potential economies of scale using products and methodologies already established in your company.


Beyond the opportunities, which we will illustrate to you, we will then advise you on what we would do in your position.

We will advise you with our experience on what, how and where to test. In which laboratory to test? In the one best suited to your needs.


Once the key has been turned, we prepare a project that is comprehensive in all details. Which materials and components to use, an important part of our dialogue on which we can best advise you. In addition to this, a cost sheet and a weight forecast, to allow you to check whether your goals will be achieved. Using industry best practices, we are convinced of this.


A consultants we give advices, then we leave it to the client to put it into practice. We are not like that: we take off the tie and put on our work clothes when needed. We launch the production of the samples, we are present during the gluing of the doors, we offer support during the process and shoeing, we proceed with our technicians to the installation of the samples in the laboratory and we are physically present at the testing. We manage the post-test documentation review phase, explain the documentation to you and remain available for all issues related to results management.


In addition, we offer you comprehensive consultancy during all stages of certification, assisting you:

  • in the planning and budgeting of activities, to determine an investment plan;
  • During all the communication with the notified body;
  • during sampling (withdrawing products for testing);
  • in implementing your FPC – Factory Production Control;
  • In preparing the necessary documentation including instructions and labels;
  • with our presence during initial inspections;
  • afterwards, as support for all management issues.