Chimney Balloon

Chimney Balloon

Credit: Chimney Balloon LLC

What makes this product green?

  • Reduces heating and cooling loads
  • Prevents moisture or air quality problems


The Chimney Balloon is an inflatable damper used to seal residential chimney flues. Inflated by mouth via a flexible plastic tube, these balloons fill small crevices within the chimney to create a tight seal, minimizing energy lost through leaking dampers while preventing creosote fumes and soot from entering the building. Placement of these balloons depends on flue design, but they are available in a variety of sizes to fit most chimney sizes and shapes. Smaller models of these PVC-free dampers are made from alternating layers of polyethylene (PE), ethylene vinylCommon term for polyvinyl chloride (PVC). In chemistry, vinyl refers to a carbon-and-hydrogen group (H2C=CH–) that attaches to another functional group, such as chlorine (vinyl chloride) or acetate (vinyl acetate). acetate (EVA), and polyvinylidene chloride (PVDC)—a common food wrap—whereas larger models consist of five alternating layers of PE and polyacrylate (PA). If a fire is accidentally lit while in place, the balloon will shrink and drop out of the flue, according to the company, but care must be taken not to block chimneys used to vent other appliances.


Manufacturer Information

Chimney Balloon LLC
2123 N. Pontiac Dr.
Janesville, WI 53545
Phone: 608-467-0229
Fax: 206-984-4611

Listed in: Air Barriers, Masonry Accessories


Jul 1, 2009 10:55 AM ET

economical and versatile chimney plug
by Jason Raddenbach

I have aided many people in sizing up their fireplace with a Chimney Balloon for any number of reasons: Stopping a cold draft, stopping chimney odor, stopping birds, bats, asian beetles or wasps from entering through the flue, or even keeping cats out of the smoke chamber of the chimney. Here are some pictures of chimney balloons installed in fireplaces:

Energy raters have started using the Chimney Balloons during blower door testing to keep the "soot puff" from comming out of the fireplace when the home is pressurized.

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