Yes we did, from memory it takes a week to reproduce a 15 a day 10 year habit. Originaly used for CRT's to see if the smoke could get in behind the glass contrast screen but now to see if the negative pressure of the cooling fans causes any problems with the flat panels.
Interestingly the products are tested to work in humidity, so unlike some manufacturers where your equipment has to be specialy treated if you move to a more humid climate B&O do this as standard.