The warranty periods for individual products are written into the table which constitutes an annex to these Terms and Conditions. The warranty period commences on the date of delivery of the goods. The warranty is conditional on adherence to all provided instructions for installation and maintenance and adherence to the general principles of maintenance of air‐treatment equipment and the filtering of supply air, minimum EU3. Irrespective of the level of filtering used, impurities from the distributed air might gradually clog the micro‐perforation openings. Any reduction in the through‐flow and function of the outlet for this reason is not a ground for a warranty claim and is resolved by washing the outlet. Significant soiling could lead to damage to the fabric or connected structures by excessive overpressure and in such case a warranty claim shall not be recognised. The product may not be exposed to the effects of substances which could chemically impair it. Dripping water might be coloured by the fabric dye.