Explore Security Chimneys' High-Performance Venting Solutions for Boiler Exhaust, Grease Duct & Generator/Engine Exhaust

At VHF Sales, we’re proud to offer premium venting solutions from Security Chimneys, a trusted leader in the commercial and industrial HVAC world. Whether your project needs high-efficiency venting for boilers or heavy-duty systems for grease duct applications, Security Chimneys has a full range of products to meet your needs — all approved for use in both Canada and the U.S.

Here’s a closer look at the outstanding lineup available through VHF:

Secure Stack CIX/CAX

Certified for commercial chimney, grease duct (CIX only) and diesel exhaust applications. When you need maximum performance with minimal heat loss, the Secure Stack CIX and CAX systems deliver:

• 2" of densely packed insulation ensures the lowest possible heat loss.

• Certified for 1" clearance to combustibles (CIX) and 2" clearance for grease duct applications (CAX).

• Rugged construction with thick-gauge 304 or 316 stainless steel inner liners for strength and longevity.

• Patented self-centering assembly system simplifies installation and accelerates setup.

• Flexible coupling design minimizes hardware needs and uses high-temperature silicone seals.

• Available in sizes from 5" to 36" diameters.

• 1-year and 15-year limited warranty options available.

Secure Stack Pro

Deliver top performance, installation convenience and versatility for commercial chimney breeching and engine exhaust applications. Designed for projects that demand strength and ease of installation, the Secure Stack

Pro stands out with:

• Thick-gauge 304 or 316 stainless steel inner liners and outer casings in 304, 441, or galvanized steel.

• Centering flue extensions simplify installation with fewer steps and higher precision.

• Modular design for quick and consistent assembly.

• Sizes from 5" to 36" diameters.

• Certified to major standards including UL 103, UL 103HT, and others.

• 1-year and 15-year limited warranty options.

Grease Duct - Kitchen Exhaust

For demanding grease duct applications, Security Chimneys offers a solution engineered for superior safety and durability:

• Heavy-duty stainless steel construction provides maximum corrosion resistance.

• Round duct design improves structural strength while reducing weight.

• Built-in 2-hour fire rating eliminates the need for additional fire-rated enclosures.

• Modular assembly speeds up installation times.

• Inner casing available in 304 or 316 stainless steel.

• Available in 5" to 36" diameters.

• Certified to UL 1978 and UL 2221.

• Backed by a Limited Lifetime Warranty for peace of mind.

Secure Seal - Condensing & Standard Boiler Flue

When low-temperature, high-efficiency venting is required, Secure Seal is the solution:

• Single and double wall construction for Categories I, II, III, and IV gas-fired appliances.

• Type BH gas vent system rated for up to 480°F.

• Flexible vent design supports direct vented appliances like high-efficiency boilers, furnaces, and tankless water heaters.

• Viton® seals resist harsh chemicals and conditions such as sulfuric acid exposure.

• AL29-4C® stainless steel material ensures superior corrosion resistance.

• Available in diameters from 3" to 24" (SS, SSD, SSLD, and FLX models) and up to 36" for LCD/LCOD.

• Certified to UL 1738 and UL 2561.

• 15-year warranty included.

Why Choose Security Chimneys Through VHF?

Partnering with VHF means you're not just getting a product — you're getting a team that’s ready to size, select, and budget with you every step of the way. Our expertise ensures that you get the right venting system for your application.