Boiler Stack and Breeching Systems
DuraVent pressure stacks and special gas vent for steam and hot water boilers, sized to the boiler and installed by McKenna Boiler Works, Inc. Standard catalog systems, or a custom design worked out with DuraVent’s engineers.
Code-built boilers and vessels
Code repairs and alterations
Factory-authorized Tech Center
Factory-authorized Burner Tech Center
Fifth generation, family-owned
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McKenna Boiler Works, Inc. sizes, supplies, and installs DuraVent stack and breeching systems for commercial and industrial boilers throughout California. Hot, dry flue gas from steam boilers and other non-condensing boilers goes into DuraStack or DuraStack Pro pressure stack, with a 0.035″ 304 or 316 stainless inner flue, 5″ to 36″, listed to UL 103. Condensing boilers get FasNSeal, DuraSeal, or PolyPro special gas vent. When a layout falls outside a catalog system, McKenna designs the stack with DuraVent’s engineering team. Call (323) 987-1816 or email info@mckennaboiler.com.
Start to finish
How a stack job runs.
01
Send the boiler data
Boiler make and model, flue outlet size, input, fuel, and photos of the room and roof. A McKenna engineer reviews it.
02
Size and select
We size the stack to the boiler and pick the DuraVent system for the flue gas and the clearances in your room.
03
Submittal and quote
You get the quote with the DuraVent submittal. Custom layouts are designed with DuraVent’s engineering team.
04
Install and start up
Our crews install the breeching and stack to the listing and code, then check it during boiler startup.
At a glance
Stack and breeching specifications.
McKenna sizes every stack to the boiler it serves: the flue outlet, input, fuel, and the route from the boiler to the termination. The DuraVent system is picked by the flue gas the boiler makes.
Supplier
DuraVent
Pressure stack
DuraStack and DuraStack Pro
Special gas vent
FasNSeal, FasNSeal W2, DuraSeal, PolyPro
Diameters
5″ to 36″ pressure stack; 3″ to 16″ FasNSeal
Inner wall
0.035″ 304 or 316 stainless (pressure stack)
Listings
UL 103, UL 2561, UL 1738, ULC S636*
Installed to
The listing, the boiler maker’s venting requirements, and CMC Chapter 8
Works with
McKenna boilers and other brands
Design
Catalog systems, or custom-engineered with DuraVent
*Listings vary by system. UL 2561 (1400°F factory-built chimney) applies to DuraStack Pro. UL 1738 and ULC S636 apply to special gas vent. In the U.S., PolyPro is listed with the boiler it serves.
DuraVent systems
DuraVent stack systems.
Hot, dry flue gas from a non-condensing boiler goes in a pressure stack. Cool, wet flue gas from a condensing boiler needs special gas vent. The venting category the boiler maker lists settles it.
DuraStack
- Double-wall positive pressure chimney for boiler breeching and stacks, 5″ to 36″.
- 0.035″ 304 or 316 stainless inner wall; 2″ insulated (DIS) or air-insulated (DAS).
- UL 103 listed; 1″ clearance to combustibles on DIS for building heating appliances.
DuraStack Pro
- Heavy-duty pressure stack for low- and high-pressure steam boilers, furnaces, and engine exhaust.
- Single-wall through 4″ insulated, 5″ to 36″.
- Listed to UL 103, UL 103 HT, and UL 2561 (1400°F).