What is this and can I exhaust out of it?

Lol…I’m having drinks already…Banjo Bowl…so crawling onto the roof today is out. But but my plan for tomorrow was to do just that…I want to take my daughters old bike tassels and tape them inside the chute (so wind won’t blow them, but rather the air movement from the basement)…run my inline and see if they move…also to remove the ducting from the furnace to the vent to confirm they’re not connected.
My gf will shine the 1,000,000 lumen spotlight (yes, 1 million lumens…apparently…lol) in there and I’ll see if I can see it from intake x2 or exhaust x2.

Very fuckered message…drinks…GO BLUUUUUEEREE!!!

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