An inflatable barrier that can be inserted through most existing access doors in duct work, a duct balloon will perform much better than wood, or wood frames and plastic sheeting. Constructed of wear resistant fabrics, with some rated up to 500°F (260ºC), a duct balloon can stand up to the toughest jobs. Using the supplied blower system, they install quickly and fully inflate in five minutes or less. And when you need to remove the barrier, simply turn off the blower and open the large deflation zipper. Simple, easy, and cost effective. Keep reading to learn how using a duct balloon can save you time and money.


FAN ISOLATION

Axial flow fan isolation can be tricky. Many fan systems do not have dampers downstream, so when one fan is taken out of service, there is a high risk of back flow if adjacent fans are still running. Solve this with a duct balloon.

Installed in this type of application, a duct balloon can mitigate back flow issues, while providing excellent sound absorption qualities when used in high noise environments. In fact, high noise levels generated in the area of out of service fans from the adjacent operating fans can be greatly reduced by using a duct balloon, increasing the time workers can be exposed, allowing you to finish faster, with less cost. 


WORK PLATFORM

Specially designed inflatable duct balloons can be used as temporary platforms in confined spaces. Company safety rules may dictate that any employee working in a confined space with converging walls must be able to exit the duct work without assistance, otherwise a confined space rescue team may need to be present when someone is working in this type of environment. We now offer specially designed Duct Balloons that can be used as an inflatable platform. A redundant blower connected to an independent power supply can also be supplied if necessary to meet additional plant safety requirements.

The inflatable platform inflates in less than one minute and can support the weight of two people. For this application, it serves as a temporary platform so that pick boards can be installed at the desired elevation inside of the precipitator. Past practices required the installer to balance themselves on small grab bars inside the sloped walls of the hopper while installing these pick boards. The pick boards provide a more rigid platform so that maintenance can be safely performed on the electrical components.


FLY ASH CONTROL

Controlling fly ash dust during the duct work cleaning process is a difficult task. In the past, temporary barriers made from 2 x 4 wood frames were built over the existing ID fan dampers and covered with plastic sheeting. While the duct work that surrounds these dampers are square on the sides, the top and bottom areas are sloped, making it difficult for a home made barrier to create a good seal. With a duct balloon, you can properly seal the gap, allowing for fast, easier, and more efficient removal of fly ash between precipitator and ID fans.


COAL PULVERIZER ISOLATION 

Coal pulverizers typically have guillotine style isolation dampers in the primary air ducts. This duct work can be round, square or rectangular. The existing isolation dampers are used to cut off the flow of hot air to the out of service pulverizer so that maintenance can be performed while the unit is on line. Unfortunately these dampers do not always seal properly due to age or binding. Care should be taken to ascertain the operating temperature in the area where the Duct Balloon will be installed as this maybe higher than what our high temperature material is rated for, which is 500ºF (260ºC).

Duct balloons are typically supplied in a 3’0” (915mm) thickness. In a coal pulverizer application, this thickness may not always work due to clearance problems such as a tight radius in round ducts or stiffeners inside square and rectangular ducts. Also, a check should be made to see if any flow monitoring instrumentation could be in the way of where the Duct Balloon would be installed. In this case, it can be made thinner, sometimes a little as 10” (254mm) and still perform well.