For Fireplaces sized 30″ up to 70″ – a Minimum of 3′ rise off the top of the fireplace is required before any elbow
For Fireplaces sized 80″ up to 100″ – a Minimum of 6′ rise off the top of the fireplace is required before any elbow
Installation Manual (pgs 60-69) for specific venting details
These minimums are required to ensure a natural draft is able to successfully remove the products of combustion.
The only exception to this for Front Facing/See Through fireplaces is to use the 45 degree elbow details within page 86 of the Installation Manual to work around any recess directly above the fireplace.
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