There was an error emailing this page. Hilton and Starwood will soon allow guests to unlock their rooms via a smartphone app. Starwood, owner of the Sheraton, Westin and W hotel chains, has upgraded 30,000 room locks in nearly 150 hotels so they can be unlocked with the new app. Hilton is planning to enable guests to do the same thing in its 600,000 rooms next year. That hotel chain will begin by piloting a smartphone app at 10 U.S. properties in early 2015. Also, in early 2015, Hilton's HHonors mobile room key app will be enabled at all U.S. properties of Conrad Hotels and Resorts.
Air gap (networking) An air gap, air wall or air gapping is a network security measure employed on one or more computers to ensure that a secure computer network is physically isolated from unsecured networks, such as the public Internet or an unsecured local area network.
If you drain the condensate into the sewar system, there needs to be an air gap. A trap isn't an air gap. You can run the condensate into a condensate pump and run that line into the sewer line, as that would be an air gap, but it's not wise to go directly from the coil to the waste line. As for the question of why the trap.