Another thing to add why have your air duct cleaning pittsburgh pa cleaned if the ductwork isn't sealed and tight.The dirt just comes back.I can't tell you how many times I've been asked about duct cleaning when the indoor coil is plugged up.One other thing that comes to mind I've seen piles of torn up flex duct next to non hvac contractors that provide duct cleaning.
To see this working, head to your live site.
I read that Post and got it fine and informative. BCS Cleaning Services