Forced air furnace advise

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Does anyone have any experience with  this type of forced air furnace? 

I just found this surprise in a duplex I have under contract in the Minneapolis/Saint Paul area.

It was updated to Gas at some point in time. Last time it was looked at was 2012.

I'm just wondering if its even safe and how costly these can be.  I believe it would have to be updated a some point with a whole new system.

If anyone knows an HAVC person that could help me with that in the next several days please send my way in private message.

Let me know.

Thank you

Jonathan