This is a cache of https://www.paroc.com/en/applications/technical-insulation/process-industry/equipment-and-filter-insulation/flue-duct-insulation. It is a snapshot of the page as it appeared on 2026-02-04T00:18:04.162+0000.
Flue duct insulation | Paroc Applications
Skip to main content

Flue duct insulation

The right insulation for flue ducts

The transportation of large quantities of air or other gases is crucial in many industrial settings. This process is often characterized by high flow speeds, temperature changes, and pressure fluctuations within the flue duct systems. In addition to normal calculation parameters (temperature, size, length, orientation), the internal convection surface coefficient may affect thermal results.

Finding an optimal solution for each unique application can be challenging. It is important to consider characteristics such as resilience, longevity, energy efficiency, and mechanical strength.

The right insulation for flue ducts, image

Benefits from Flue duct insulation

Complete insulation system for indoor and outdoor applications

With PAROC® Clad system, we offer a water-proof product line consisting of pipe sections, elbow solutions, lamella mats and accessories. The Clad facing is water resistant (according to PN-EN 1928:2002 method B), UV resistant (when installed with Paroc® Clad Alu tape), resistant to salt water, high puncture resistance (tested according to EN 14477) and resistant against hail storms class HW3.

Due to its special facing, PAROC® Clad system eliminates the need for additional cladding or prefabrication resulting in savings on costs and installation time and enabling an easy installation even under high wind loads.

For high temperatures

Our products can provide long-lasting performance also at high temperatures and are resistant even at service temperatures of up to 700 °C, ensuring smooth operation.

Please consult the respective product data sheet for more information.

High flexibility and strength

Our PAROC® Pro Slabs (WR), Wired Mats (WR) and Mats (WR) have been specially developed to meet these challenging demands and offer optimum insulation properties even in the event of major temperature fluctuations due to stone wool’s high flexibility and mechanical strength.

Please consult the respective product data sheet for more information.

Preventing condensation in the process industry

Effective energy flow management is crucial for the functionality and economic operation of the process industry. Our specific flue duct insulation solutions provide excellent thermal insulation at high operating temperatures and help prevent condensation while offering strong mechanical strength. Preventing condensation in flue gas ducts is crucial as flue gas contains substances such as sulfur, which can cause corrosive acidic deposits on the inner surface of ducts when the temperature drops below the gas condensation point. It's therefore important to maintain the flue gas temperature above the critical zone and avoid cold spots.

Double the protection

We recommend using a double layer of insulation for flue ducts to minimize the risk of corrosion, prevent cold bridges (see CUI page for more information), and reduce thermal loss. While both layers are typically made of slabs, it is also possible to use slabs with mats, depending on the specific requirements of the system.

For a standard system for flue gas ducts, we suggest using a double-layer, water-repellent insulation solution with PAROC® Pro Slabs (WR) 640, secured with welded pins and self- locking washers. These slabs offer excellent thermal insulation at high temperatures and high mechanical strength. Learn more about CUI >

Suitable for any geometry

Slabs are the most cost-effective option, especially for rectangular ducts, as they can effectively cover the corners of the flue gas duct for optimal insulation thickness. An alternative solution would be to use PAROC® Pro Wired Mats (WR) or PAROC® Pro Lamella Mats (WR). For smaller dimensions and complex geometries, mats with a minimum nominal density of 80 kg/m3 are a viable alternative. Please consult the respective product data sheet for more information.

Based on our certifications to ISO 14025, ISO 21930 and EN 15804, we have received the Environmental Product Declaration (EPD) numbers NEPD-4100-3121-EN and NEPD-4101-3121-EN.

Double layer of insulation for flue ducts, image

Products

Filter

Show All Filters

PAROC Calculus 

PAROC Calculus is a technical insulation calculation program for dimensioning thermal insulation for various applications in the HVAC and Process industries.

PAROC Calculus features:

• Easy-to-use interface; works on PCs, tablets, and cellphones

• Calculations of heat losses, surface temperatures, and temperature drop in pipes, ventilation ducts, process industry tanks, valves, and flanges

• Simple input of pipe diameters and duct dimensions (predefined)

• Correcting for thermal bridges of pipe and duct suspensions

• Print calculations as a PDF. Multiple simultaneous printouts in PDF are possible

• Saving projects and customizations (for registered users)

• Calculations based on the ISO 12241:2022 standard

Screenshot of Paroc Calculus software interface showing insulation calculation results for HVAC applications

Contact Paroc Technical Insulation