Hi,<div><br></div><div>I've got question. I want to model in the building windows which will be closed all the time . Can I declare in this situation the window as crack or I had to use large-opening ? The second question. In the large-opening what is " extra crack length" ? It is circumference of the leaky window?</div>
<div><br></div><div>Thanks for any reply.</div><div><br></div><div>Ola </div>