Good afternoon,
Saw this support for the furnace flue. Does not look right to me.
Looks like plastic materials, which would be combustible.
What are your thoughts?
What I see is a supply duct, not the flue.
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Most of the vent is out of the frame and shows no combustible support. I see a metal duct with combustible support webbing, but it’s not a gas appliance vent.
That’s not a furnace.
That’s not a furnace
Ha! Serves me right for not paying attention!
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Actually, you where paying attention. 
Good on you Dom.