Make a decision
High efficiency furnace versus older metal flue
One scope
Condensing equipment commonly uses a drain and manufacturer-specified plastic venting.
The other scope
An older non-condensing installation may use a metal vent or chimney connection.
A concrete example
A quote to clean a condensate trap makes sense only if the installed furnace has one. A metal-chimney appliance raises different venting questions; share the model label first.
Which question settles it?
Provide the model and photos so service matches the installed system rather than a generic package.