We use cookies to ensure a smooth, secure, and ever-improving experience on our website. By continuing to browse, you agree to our use of cookies as detailed in our Cookie Policy. Enjoy your visit and let us now if you need any help!
Cookie Preferences
We use different types of cookies for various purposes. Please select which you allow:
DM44 - 440mm square x 300mm high access casing (59-130725)
National Flues offers the robust DM44 access casing, ideally suited for high-performance chimney flue systems. This 440mm square x 300mm high access casing, crafted from natural pumice, is perfect for inserts, stoves, open fires, and cookers using wood, solid fuel, oil, or gas. Enjoy exceptional heating efficiency with a system that complies with HETAS standards and carries a CE mark. Experience the innovative blend of durability and energy efficiency in your heating solution with National Flues’ trusted product range.
Hover to Zoom / Click for Gallery
Out of Stock – Pre-order Now
£75.99
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
High quality dual wall design for superior thermal performance
Efficient 440mm square x 300mm high access casing with a 220mm internal diameter
Built from natural pumice for excellent insulation
Suitable for a wide range of heating appliances (wood, solid fuel, oil, and gas)
HETAS approved and CE marked, ensuring top safety and reliability
Designed for quick and easy installation
×
Email Product
Enter your email address to send the product details:
Please Note: All dimensions refer to the internal diameter of flues.
If unsure, please call 01670 206999 to ensure you choose the correct products.
We Won't Be Beaten On Price
At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:
Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
Operational Efficiency: We have streamlined processes to reduce overhead.
Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.
Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).
“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.
The DM44 Isokern double module (DM) block system offers an efficient and high-quality solution for your chimney needs. With an outer casing size of 440mm square and a height of 300mm, this access casing maintains optimal flue gas temperatures while preventing heat transference to the outer casing. The dual wall design permits thermal movement, reducing the risk of cracking and consequent leaking or staining.
Constructed from pumice, a natural insulator, the DM44 ensures your chimney reaches and maintains optimal temperatures quickly, enhancing the performance of your heating appliance. Ideal for use with inserts, stoves, open fires, and cookers using wood, solid fuel, oil, or gas, this system is HETAS approved and CE marked, ensuring top quality and reliability.
SKU: 59-130725
Technical Specifications
SKU
59-130725
Dimensions
440mm square x 300mm high (with 220mm internal diameter access)
Material
Pumice
Certification
HETAS approved, CE marked
Warranty
10 Years
Distance To Combustibles
0 on straights; 38mm on offsets on DM System
Fuel Compatibility
Wood, solid fuel, oil, gas
The DM44 access casing is designed for a straightforward installation process. Detailed instructions and diagrams are provided to ensure correct placement and sealing. It is imperative to follow local building regulations as you install the casing. Note the clearance requirements: 0 for straight installations and a minimum of 38mm for offsets on DM systems. If you are not experienced with chimney installations, seeking professional advice is recommended to guarantee safety and proper functioning.
The DM Isokern block system comes in three outer casing sizes: DM36, DM44, and DM54.
No, the DM44 is not suitable for condensing appliances, including biomass and pellets.
The DM44 is compatible with wood, solid fuel, oil, or gas appliances.
Yes, the DM44 is designed for quick and easy installation. Detailed instructions are provided in the installation guides.
Pumice is a natural insulator, allowing flue gases to reach optimal temperatures quickly and maintain those temperatures, enhancing heating appliance performance and reducing the risk of condensation and soot build-up.
Yes, the DM44 Isokern DM system is HETAS approved and CE marked, ensuring high quality and compliance with safety standards.
Yes, National Flues offers reliable nationwide delivery and trade accounts for our customers, ensuring you get the best service and value.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Wednesday, April 30th.
If you need faster stove or fireplace delivery please give us a call.
We can often reduce longer lead times if we pay the carrier £25 for express delivery.
Visit our Shipping Information page for more information.
Warranty & Returns +
All our products come with warranties. Mi-Flex offers a lifetime guarantee.
Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.
Price Match Guarantee +
We will match any price like for like on a retail basis. Give us a call if you find it cheaper and want to buy from us.
Read our review in our DM44 - 440mm square x 300mm high access casing buyers guide
Introduction
When it comes to ensuring the longevity and efficiency of your chimney system, choosing the right access casing is paramount. The DM44 access casing from National Flues is designed to meet the rigorous demands of modern heating solutions while ensuring your system remains safe and effective. In this guide, we will explore the features, benefits, installation processes, and frequently asked questions related to the DM44, helping you make an informed decision.
Key Features & Benefits
Superior Thermal Performance
With its 440mm square dimension and 300mm height, the DM44 is engineered to maintain optimal flue gas temperatures. Its dual wall design reduces the risk of thermal cracking and leakage. The natural insulating properties of pumice allow the flue to achieve and maintain the desired temperature levels quickly, enhancing the efficiency of your heating appliance.
Versatile Compatibility
This access casing is not limited to one type of fuel. Whether you use wood, solid fuel, oil, or gas for your heating, the DM44 is designed to perform reliably across a variety of applications. This versatility makes it a practical choice for many different properties, ensuring you get maximum value and performance regardless of your heating method.
Safety and Compliance
Built in accordance with strict standards, the DM44 is HETAS approved and CE marked. This provides peace of mind, knowing that your installation complies with current safety guidelines and is built to the highest quality standards. The robust construction and design mitigate the risk of potential failures, making it a safe addition to any chimney flue system.
Easy and Efficient Installation
Designed specifically for installers of all levels, the DM44 provides a hassle-free experience. Detailed instructions and diagrams are included to guide you through every step of the installation process. Whether you are a professional or a DIY enthusiast, you can be confident that your installation will be both quick and secure.
Installation Details
Installing the DM44 is a straightforward process, but care must be taken to adhere to the provided guidelines. Begin by ensuring that your chimney meets the necessary clearance requirements: 0 clearance for straight installations and at least 38mm for offsets. Follow the step-by-step diagrams included in the documentation, and verify that all connections are secure and sealed properly to prevent any heat loss or structural issues. Remember, while the installation is designed for ease, if you have any doubts, it is always wise to consult a professional.
Addressing Common Objections
Concern: Compatibility with various heating fuels
Many customers worry whether a single access casing can effectively serve different heating systems. The DM44 has been engineered with versatility in mind, making it a reliable option whether you run a wood-burning stove, oil heater, or gas appliance.
Concern: Durability over time
The dual wall construction combined with the natural durability of pumice ensures that the DM44 withstands the test of time. It is designed to accommodate the thermal stresses typical in a chimney system, reducing risks of cracking or damage from prolonged use.
Concern: Installation complexity
While some may fear complex installation procedures, the DM44 comes complete with clear instructions and helpful diagrams. This ensures that even those with limited technical expertise can achieve a safe and effective installation. For absolute certainty, professional installation services are also available.
Why Choose the DM44?
The DM44 access casing offers a blend of durability, efficiency, and safety that is difficult to match. With its robust construction and compliance with industry standards, it provides an ideal solution for modern chimney systems. Not only does it help maintain the necessary flue temperatures, but it also adapts to a wide range of heating applications, making it the preferred choice for both residential and commercial installations.
National Flues stands by the quality of the DM44 by offering competitive pricing, reliable nationwide delivery, and exceptional customer support for both retail and trade customers. Its easy installation, paired with outstanding thermal efficiency, makes it a smart investment for anyone looking to upgrade or maintain their chimney system.
Conclusion
Ultimately, the DM44 access casing is more than just a component of your chimney system—it's a strategic asset that can boost the overall performance and safety of your home heating setup. With excellent insulation, reduced risks of damage, and a design that favours both efficiency and ease of installation, it is an outstanding addition to any property. Make the proactive choice for enhanced performance and safety in your heating system.
Enhance your home’s heating efficiency and add our DM44 to your cart or call 01670 206 999.
Compatible and other products that may be of interest...
