DM44 - 180mm ID starter flue block
At a Glance
- Premium pumice insulation for excellent thermal performance
- Designed for the Isokern DM block system
- Quick and straightforward installation
- Suitable for wood, solid fuel, oil, and gas appliances
- HETAS approved and CE marked for safety and compliance

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.
Have Questions?
Phone: 01670 206999
Email: [email protected]
- Info
- Specs
- Install
- FAQs
The DM44 - 180mm ID starter flue block is an essential component of the Isokern DM block system, which is celebrated for its double-module design. These blocks are constructed from pumice, a natural insulator, helping to maintain optimal flue gas temperatures while minimizing heat transfer to the outer casing. This dual-wall system not only promotes efficient heating but also reduces the risk of cracking, leaks, and stains.
The DM44 is quick and straightforward to install, making it a convenient choice for stoves, open fires, cookers, and inserts that burn wood, solid fuel, oil, or gas. However, it is not suitable for condensing appliances, including biomass and pellet stoves. Certified by HETAS and CE marked, the Isokern DM system ensures compliance with key industry standards, adding peace of mind to your purchase.
SKU: 59-130720
Technical Specifications | |
---|---|
Inner Diameter | 180mm |
Overall Height | 150mm |
Material | Pumice |
System Compatibility | Isokern DM block system |
Designation (DM System) | EN1858 - T450 N1 D 3 G(00) |
Designation (Liner System) | EN1857 - T600 N2 D 3 G |
Warranty | 10 Years |
Clearance To Combustibles | 0mm on straights; 38mm on offsets on DM System |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 4th. 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. If you find it cheaper within 48 hours, we'll refund the difference.
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National Flues Ltd Verdict
The DM44 - 180mm ID Starter Flue Block is a top-tier choice for anyone looking to enhance their chimney system. Offering superior insulation, easy installation, and approved safety standards, this flue block delivers on all fronts. Plus, with National Flues' reliable nationwide delivery and competitive pricing, it’s an excellent pick for both retail and trade customers.
The DM44 - 180mm ID Starter Flue Block is designed to be the foundational element in the Isokern DM chimney system, providing superior insulation and efficient heating performance for various types of heating appliances.
National Flues is a leading supplier of high-quality fireplaces and flues across the UK. Specialising in reliable delivery and competitive pricing, National Flues serves both retail and trade customers, offering secure online payments for a hassle-free shopping experience.
