[Greenbuilding] Visible Flames (Fireplaces) in Tight Houses

[conservationarchitect at rockbridge.net]

I intend to build only high standard thermal envelopes.  I have a client that expresses interest in this except she wants a fireplace.  Ugh!  I am looking for ways for her to see an open flame that will not compromise the benefit  of a high standard thermal envelope.  I have suggested an outdoor air fed wood stove with a glass door.  This could be installed to look like a traditional fireplace.  She has expressed interest in unvented gas fireplace, Ugh again!  I certainly do not want CO being introduced by design into a tight thermal envelope.  Increasing ventilation rates would be required.  I am wondering if a vented gas fireplace that has outdoor air feed would be acceptable.  I am wondering if others on this list have managed clients with the expectation of seeing a flame in a tight thermal envelope.  
I am beginning my career as a contractor.  My intention is to sale predesigned homes that incorporate the high standard thermal envelope with my details so my client and I know what the cost is up front.  To do this, I am limiting what I will offer.  This is one reason I am moving away from my previous custom design architect model where you must involve your client in all decisions to build there dream building.  To achieve high energy performance buildings, multiple systems need to be complimentary.  This is why I want to sale a package that achieves this.  I am wanting to control these choices.  Sometimes that means turning down projects.  
Eli 
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