However, you still need to make sure the balloon is within reach, since once you remove the extension, you will still need to close the valve at the bottom of the balloon before you can seal it in place above the damper. So there is still the need for fireplace gymnastics once you have the balloon inflated in place to remove this extension, close the balloon valve, and then close the damper off. Not a perfect solution, but perhaps better than nothing at all. In principle, if you could leave this in place, you would not need to do that, but the stiffness of the rod will probably prevent many dampers from closing, and it also could detach at the balloon end, leaving an exposed valve there so the balloon would lose pressure.
The ideal design would be a telescopic one, so you could leave the extension rod attached and shorten it if you want to close the damper, but then reach up and extend it when you need to inflate or deflate the balloon. Undoubtedly, such a design which was also reasonably airtight is beyond the price point that would be required for an accessory such as this.
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