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Thanks for the "response".

Hearthman,

Yes, I already knew of the different vent piping. I was just curious as to the reasons (engineering) behind it. You say it is because it is part of a "listed" system, and cannot be...

I recently replaced an ~8 year old Heatilator Direct Vent Gas Fireplace with a new Lennox Fireplace. Both are Multi-sided, and 38,000 Btu. The Heatilator used 5"x8" DV venting, and of course the...