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I vote no.
It's basically a thin sheet metal tube, it may seem strong, but not really.
Where I live it's a serious code violation to attach anything to a gas/furnace vent.
Anything that could damage the vent or otherwise cause it to get blocked/restricted can vent the poison gas back into your house and kill you!
Get a simple and cheap set of gable end brackets and attach the mast to the outside wall.
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