Venting Requirements
Our barbecue ovens are listed under multiple standards, including U.L. 737 (Fireplace
Stoves), U.L. 2162 (Commercial Wood-Fired Baking Ovens), and U.L. 391 (Solid-Fuel
and Combination-Fuel Central and Supplementary Furnaces. These listing provide two
alternatives for exhausting our units: direct venting and exhaust hood venting.
In all cases, it is imperative to obtain the approval of the AHJ (Authority Having
Jurisdiction). This will typically be the mechanical inspection department of the
local municipality’s building inspection division and/or the local fire marshal.
Our listings under U.L. 737 and U.L. 391 permit direct venting and the
ventilation standard cited in each is NFPA 211 (Standard for Chimneys,
Fireplaces, Vents, and Solid-Fuel Burning Appliances). All of our enclosed
ovens are designed to be vented via a smokestack (chimney) with natural draft.
All models incorporate smoke-control (bypass) mechanisms to contain smoke
spillage when the oven doors or firebox doors are opened.
In all cases in which combustible construction is present, a factory-built Type
HT chimney is required (refer to NFPA 211 6.3.1.2 and U.L. 103). Examples of
such chimneys would be Selkirk “Ultra-Temp” and DuraVent “DuraTech”.
Option One: Direct Venting (Figures 1 and 3)
The chimney should be a minimum of 10 feet in height (oven top to chimney
top) and 14 to 18 inches in diameter. It should be straight (no offsets) and
vertical. This application falls under the classification of “Low Heat Non-
Residential Appliance” with continuous outlet flue gas temperatures less than
1000 degrees F. The maximum draft is 0.03 inches water column and a
barometric draft regulator must be used if the draft exceeds that draft at full
firing conditions. This can occur as an example when the chimney is very high
as might be the case in multi-story buildings.
If no combustible construction is present (examples: exterior installations or
installations in which the oven is faced into a non-combustible exterior wall
and the chimney is either uncovered or covered with a non-combustible
weather covering), then a single wall metal chimney (Figure 5B) is acceptable
if approved by the AHJ .
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