Firechests - 500 Magnum Firechest with Damper
At a Glance
- Wide fire opening capability up to 1.2m for versatile design solutions
- Constructed from highly insulating pumice for optimal heat retention
- HETAS approved and CE marked, ensuring compliance with UK safety standards
- Delivered as a flat pack for straightforward, on-site assembly
- Compatible with 200mm internal flue diameter liners or DM systems for flexible installation
- Backed by a solid 10-year warranty for long-term performance

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 500 Magnum Firechest with Damper, a part of the Isokern range from National Flues, is designed for those aiming to construct a neat and efficient fire opening up to 1.2m wide. Delivered as a flat pack, it ensures easy and quick assembly, allowing you to set up a preformed fire opening ready for finishing. Made from pumice, a natural insulator, this firechest provides remarkable heat insulation.
Pumice's insulating properties enable the flue gases in the chimney to reach their optimum temperature swiftly, contributing to the appliance's optimal performance sooner after lighting. It also maintains the chimney's warmth for extended periods as the appliance's heat output decreases, enhancing performance while reducing condensation and soot build-up. The Isokern DM system is HETAS approved and CE marked, ensuring top-notch safety and efficiency.
Please refer to the installation guides for complete instructions.
SKU: 59-130773
Technical Specifications | |
---|---|
SKU | 59-130773 |
Designation DM System | EN1858 - T450 N1 D 3 G(00) |
Designation Liner System | EN1857 - T600 N2 D 3 G |
Material | Pumice |
Warranty | 10 Years |
Fire Opening Width | Up to 1.2m |
Internal Flue Diameter | 200mm |
Distance To Combustibles | 0 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 500 Magnum Firechest with Damper is a high-quality product that's perfect for anyone looking to install a wide and efficient fire opening. As always, National Flues offers reliable delivery across the UK, catering to both retail and trade customers.
The 500 Magnum Firechest with Damper is designed to provide homeowners and builders with a reliable and efficient solution for creating wide fire openings, enhancing heat efficiency and reducing the likelihood of condensation and soot build-up.
Isokern, a respected name in the fireplace and flue industry, is known for its innovative use of pumice in creating high-quality firechests and chimney systems, trusted by homeowners and professionals alike for their efficiency and reliability.
