The Ventinox Difference

Degradation of chimney structure caused by moisture in the flue. Water damage to interior house walls caused by porous chimney liners. Condensation leakage through chimney thimbles and cleanout doors. Flue condensation caused by cool chimneys. Staining of chimney masonry due to excessive moisture in the flue. Insufficient chimney draft caused by improperly sized flues. Spalling and other masonry damage resulting from freeze-thaw cycles. Improper clearance to wood framing and other combustible materials. Cracked flue tiles caused by chimney fire. Unlined chimney or improperly constructed liner. Inadequate number of flues within chimney. Downdrafting or smoking caused by unsteady draft.

We strongly recommend stainless steel over aluminum liners... ...and this is why: This is an aluminum liner only fourteen months after it was installed to vent an 81% efficient gas boiler.

The Ventinox Chimney Lining System was designed to upgrade substandard chimneys and/or match vent size to the requirements of the heat source as required by the National Fire Protection Association (NFPA 211). It is also ideal for building efficient chimneys in new construction.

Designing a lining system is a difficult task that requires hard choices, which relate directly to product reliability, longevity and ultimately, to the sense of security a good system will provide to the homeowner. We would like you to take a look at our criteria for making these choices.

Mechanical Considerations

Expansion: Since steel expands when exposed to heat, care needs to be taken to give it a shape that does not create stress within the system after it has been installed in a chimney. Ventinox absorbs any expansion in its corrugations and does not twist or grow in length. Therefore, Tee sections do not become deformed and Ventinox can be mortared solid at the chimney top, which creates a long lasting, watertight seal.

Liner Tightness: This is important for two reasons: First, to keep water vapors and other by-products of combustion within the liner at all times and second, to keep air (oxygen) out during a chimney fire. Using our unique and patented manufacturing process, Ventinox liners are continuously welded to form an airtight conduit from the appliance to the chimney top.

Liner Strength: Liners are used in a construction environment. They must be strong enough to take some abuse. Welding the steel and forming it into specially designed corrugations creates great strength and enables Ventinox to resist crushing and tearing.

Liner Weight: Heavier is not better. Excess weight is only a nuisance during installations, or when the extra weight could have negative effects on the chimney structure. The lighter weight of Ventinox is possible due to our special manufacturing process. The other design criteria can be met without adding extra weight.

Selecting the right steel

Choice of Materials: Is an equally important design consideration. The steel must be corrosion and heat resistant and be suited for specific applications and flue conduit environments. That's why we offer different alloys for different types of heating appliances and applications.

Ventinox HiFlex, used for fireplaces, wood and pellet burning applications, can withstand severe heating conditions and is warranted even after a chimney fire. Titanium stabilized Type 321 ss resists intergranular corrosion at high temperatures and maintains its strength. This alloy is so heat resistant it is typically used in aircraft afterburners.

Ventinox VG for gas burning appliances can withstand the corrosive elements and condensates typical in gas flues. The superferritic Type AL29-4C ss has extreme resistance to chloride pitting, crevice corrosion, stress corrosion and cracking. This steel is typically used in power plant condensers and heat exchangers.

Ventinox VFT is made from Type 316Ti ss. It is best suited to withstand the corrosive elements and temperatures typical for oil and gas vent systems. However, 316Ti ss is also strong enough to withstand the high temperatures of wood burning. Typically used in marine chemical environments, pressure vessels and chemical storage tanks.

Fireplace Direct Connect Kits are designed to lead flue gases from a stove or fireplace insert through the damper area and smoke chamber to the bottom of the chimney flue as required by NFPA 211.

FasNClamp Components eliminate the need for pre-drilling Ventinox liners and the use of pop rivets. This allows for a penetration free connection from the heat source to the outside of the home.

Insulation may be required for certain installations, but insulating Ventinox liners always enhances the performance and efficiency of a heating system.

Every Ventinox system is backed by our limited lifetime warranty and over 15 years of experience as the leaders in venting technology.

All Ventinox Chimney Lining Systems are UL Listed in the United States and Canada.