Stack Systems

As boilers are designed to operate at high temperatures, it is important to invest in a quality exhaust system to limit the risk of boiler room fires.

California Boiler carries a full line of DuraStack and FasNSeal stack systems, UL approved for all configurations to apply to a wide range of diverse boiler systems. Both systems feature smooth clean welds and mechanical locking bands, enabling a secure seal and easy installation.

Models are available in a variety of insulation widths to cover all types of insulation needs, and are pre-fabricated to ensure prompt and easy installation.

The DuraStack DIS and DAS venting systems are designed to offer the ultimate in installation convenience and versatility for a variety of applications. They are certified for commercial chimney, grease duct (DIS only) and diesel exhaust applications. Thick-gauge material for the inner pipe and coupling provides a strong and rigid assembly. Self-centering flue design significantly simplifies and accelerates the installation process. Coupling configuration (patent pending) requires only one locking band and the use of a regular, less expensive, high-temperature silicone sealant.


DuraStack DIS and DAS Venting System

A modular double-wall positive pressure chimney system. Factory built for boiler breeching, engine exhaust, and chimney stack. Grease duct (DIS only).

FasNSeal, FasNSeal 2, and FasNSeal Flex

Single-wall and double-wall special gas vent systems.

Jeremias Group


Double Wall Conical all-in-one chimney and exhaust system.


Double Wall Lighting gauge inner Conical all-in-one chimney and exhaust system.


Double Wall Conical all-in-one chimney and exhaust system.


Double Wall Vent Conical all-in-one chimney and exhaust system.

Flue Gas Dampers

Flue gas dampers are installed in the connection pipe between a boiler and the chimney and close the flue gas path, if the chimney is no longer in use. The flow safeguard prevents the cooling down of the heat generator and the installation room, which helps to save energy. In addition, they prevent a possible influx of exhaust gases of other fireplaces connected with the chimney, for example in the cascade system and have the effect of an exhaust gas silencer if there are more than one fireplace connected with the chimney.

Stainless steel or black steel flue gas dampers made by Jeremias are used in combined heat and power plants, emergency power systems, exhaust air technologies and in overpressure operation engines.

Flue Gas Duct

Flue gas ducts are made for a robust and safe connection solution between the boiler-/engine outlet and the chimney entrance. Depending on the requirement of the service life and the different compression ratio, they can be produced as a plug –in system, completely welded or as a flange system. The planning in this sector for compensators, flue gas dampers, structural steel supports is done by our experienced project leaders. In this way it is possible to offer you professionalism, knowledge, and absolute guaranty.

FS-RM - Freestanding Chimney Systems

If you are looking for a flexible solution for your chimney the FS-RM system is the best system for you.  The combination of a steel (chimney) support mast and stainless steel chimney elements offers you the possibility to customize your chimney at any time as per your new requirements.  Hence it is now possible to achieve heights of up to 30 meters with stainless steel elements.

FSA - Freestanding Chimney Systems

Free-standing, double wall chimney with a supporting couter wall and a non-expanding inner pipe for exhaust gases.  The FSA system offers flexibility and large heights.

FSA-X - Freestanding Chimney Systems

In comparison to FSA, the FSA-X has multiple inner pipes.  The “X” stands for the number of inner pipes. This facilitates to connect two or more heat producers to the same outer chimney, hence economical.

FSB - Freestanding Chimney Systems

The FSB is a free-standing, insulated and cladded steel chimney with an inner static supporting flue gas line. This system is usually affixed with one or more brackets to a building.


Single Wall Conical all-in-one chimney and exhaust system.


Single Wall Conical Lighter gauge all-in-one chimney and exhaust system.

boiler service

Quote Request

Our complete line of boiler room equipment includes a wide range of boilers, burners, hot water heaters, feedwater systems, blowdown systems, fuel efficient equipment, control systems, oil heaters and stack systems.

Quote Request

boiler rentals

Need short term? Rent your boiler equipment.

We maintain a fleet of self-contained skid-mounted rental boilers that we can deliver to your location! Learn More