"All three vented properly"???? Do you mean you test fired them and they did not backdraft or spill?

A 180 turn?
That manifold is propely sized for 205 mbtu?
Least flow resistance?
Properly supported?

Do you have any other pics Richard?
Bob

__________________
Keep the fire inside the fireplace!
IAFCI Regional Director & Certified Fireplace Inspector
Certified Master Hearth Professional & HPBA BoD