I had a Heat & Glow 8000CF-Oak firplace installed today. I was looking at the install for the vent and noted that the fireplace vent was supported at only one location along a 12 foot horizontal run. That is the vent pipe goes vertical for about 10 feet and then makes a 90 degree turn and runs another 12 feet and then exits to sidewall of the house. On that 12 foot run, there is only one support. Is that OK?

Also, where sections of pipe join, is there any taping required or is the mechancial seal the normal method of making an acceptable joint.

Thanks in advance.