To prevent people from going into real estate transactions and ripping all of the equity out from an uneducated seller. 

That's important because entering and preventing the for.mer owner from being able to return is often referred to as forcible detainer. 

I have seen builder's that run it into that location to prevent runoff at AC location.

I looked on a few different HVAC web sites and I don't see parts listed except for  thermostats and complete electric baseboards.If hydronic, then yes, but you'd have to know how to drain the boiler, solder heating element to pipes, and refill/bleed all the air out.  

Your vinyl tiles will let air leakage happen between each joint. 

The run also must not be too long; our code says no more than 25 feet.Here's some specifics from the International Association of Certified Home Inspectors:The recommendations outlined below reflect International Residential Code (IRC) SECTION M1502 CLOTHES DRYER EXHAUST guidelines:M1502.5 Duct construction.Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow.

I can read and watch videos all day to learn more about real estate investing, so that I prevent myself from making any mistake ever, but that doesn't mean I'm doing anything.  

In that way, you don't disturb your nest egg / equity in your primary and prevent getting over your head in debt ;-)Feel free to PM me if I can be of further assistance.Best,Rod

It prevents co-mingling of funds and will save you from having to class the transactions to the correct entity. 

They will synchronise calendars between the two of them to prevent double bookings.