I can see the vent pipe thru the firebox from the inside of my house. Am I missing something?A. The Majestic CDVR36NSC7 is normally vented through the ceiling or out the wall to outside, but not familiar with the "firebox" term. Check out our vent pipe guide at http://www.ventingpipe.com/direct-vent-pipe/c4277. It should give you all pieces necessary to complete chimney. I hope this helps.
Is the Mantle included with this Fireplace?A. The Majestic CDVR36NSC7 does not include the mantle.
How many BTUs?A.
The Majestic CDVR36NSC7 is rated at 15,000-20,000 BTU.