Iminyango eminingi yomlilo yensimbi iphathwa ngomdwebo ongaphezulu; iminyango yomlilo yensimbi ingahlinzekwa ngamafasitela, ama-shutter, ama-shutter okungenisa umoya, njll njengoba kudingeka. Izicabha zomlilo wensimbi nazo ziphephe kakhulu, futhi ngeke ziphazamise imisebenzi yansuku zonke yabanye abantu ngenxa yokuvula nokuvala umnyango, okungagwema izingozi ezithile.