17
+years of experience in the industry
3000
satisfied customers per year
9
Asealing class in tests
The manufacturer prepared a door with a drop-down threshold for testing, aiming to achieve a 9A result (600 Pa) and obtain a certificate confirming tightness. The construction was assembled independently, without the involvement of an Alumaster advisor, and then transported to an accredited laboratory for the scheduled test date.
On the manufacturer’s side, the situation was typical: a tight schedule, a limited number of available time slots in the testing chamber, and a significant cost for each test attempt. The company assumed that the correctness of installation and adjustment would be verified “live” at the laboratory.
In practice, however, it turned out that key preparation details (alignment of threshold components, pressure adjustments, post-transport inspection) had not been properly fine-tuned before the test. Already in the first test series, leaks appeared and the result reached only 3A, which meant no success and a loss of both budget and test slot. Only at this stage did the manufacturer decide to invite an Alumaster advisor for the second attempt.
The first attempt in the testing chamber ended with a 3A result. The source of the problem was not the drop-down threshold itself, but the preparation of the construction: imprecise installation of threshold components, inconsistent alignment, lack of final pressure adjustment and no post-transport inspection. As a result, micro-shifts and leaks appeared in critical areas — and the chamber revealed them without mercy.
During the second attempt, the manufacturer invited an Alumaster technical advisor to the site. The support included:
being present during the assembly and verifying key stages,
identifying critical areas prone to leakage and correcting them,
making adjustments right before the test (pressure points, gaps, guides),
checking replaceable components (strikers, pressure points) to eliminate micro-shifts after the first attempt.
What may seem like a “detail” in production becomes decisive in the testing chamber.
For the second attempt, the manufacturer invited an Alumaster technical advisor, who guided the preparation end-to-end — from assembling the structure to making final adjustments right before entering the chamber. We focused on eliminating the causes of the 3A result, not just the symptoms.
Here’s what we did specifically:
Verification of threshold and sash installation – checking alignment, cuts and fixings; replacing/adjusting components that were causing micro-shifts.
Sealing critical points – identifying and correcting areas typically prone to leakage (threshold joint, corners, pressure zones).
“Cold” adjustment right before the test – setting pressure points, guides and working gaps according to test conditions.
Checklists and defined roles – assigning responsibility for each step (assembly, inspection, adjustment) to avoid improvisation in the laboratory.
Post-transport control – reviewing and correcting any distortions, quick replacement of interchangeable components (strikers, pressure points).
Documentation of settings – recording parameters and reference photos to replicate the successful configuration for future tests.
Why it works: the presence of an expert on-site eliminates execution variability, while a standard of preparation and adjustment turns a one-off success into a repeatable process.
17
+years of experience in the industry
3000
.satisfied customers per year
9
Asealing class in tests
The second attempt achieved 9A (600 Pa), and the complete documentation confirmed the tightness of the construction. It’s solid proof of quality and peace of mind during audits and certification.
Standardised preparation and the presence of an advisor ensure a predictable test result and a shorter path to certification. Fewer corrections and repeat tests = real budget savings.
Checklists, clear roles and “right-before-test” adjustments turn a one-time success into a repeatable process. The team knows how to prepare future constructions — faster, more confidently and without unnecessary risks.
We are happy to share our experience and help you choose a solution tailored to your door designs.
