Top Plate - Ø 125
At a Glance
- - Robust construction engineered for MI-FLEX 316 and 904 flexible flue liners
- - 400mm square design for optimal weight distribution
- - Suitable for multiple fuel types including wood, oil, gas, and smokeless coal
- - Compliant with Building Regulations Document J and approved by HETAS/CE
- - Engineered for high temperature performance (up to 600°C T600 designation)
- - Made from durable GALV material with a Natural / Stainless Steel finish

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 Top Plate - Ø 125 is a critical component designed to provide strong support for MI-FLEX 316 and 904 flexible flue liners. Measuring 400mm square, this plate works in sync with a Top Clamp and Top Insert Sleeve, ensuring that the flue liner’s weight is effectively managed at the top of your chimney stack. Manufactured to comply with Building Regulations Document J, this top fixing accessory is suitable for a range of fuel types including wood (with moisture content <20%), smokeless coal, gas, and oil.
Rated for appliance use up to 600°C (T600 designation), our top plate guarantees a secure installation when adhered to correct guidelines. Proper chimney preparation is crucial – ensure that your chimney stack is fully weatherproofed, structurally sound, and that all pots are in good condition. For maintenance, an accessible design allows for easy inspection and cleaning, ideally performed twice a year by a certified professional, such as those registered with HETAS.
Cleaning should never involve chemical agents or mild steel tools to avoid damage to stainless steel parts. This top plate is not just a purchase; it’s a long-term investment in the safety and efficiency of your chimney system.
SKU: 20-125-P
Technical Specifications | |
---|---|
Size | 400mm square |
Material | GALV (Galvanised) |
Finish | Natural / Stainless Steel |
Compatible With | MI-FLEX 316 & 904 flexible flue liners |
Fuel Types | Wood (<20% moisture), oil, gas, smokeless coal |
Temperature Rating | Up to 600u00b0C (T600 designation) |
Certifications | HETAS, CE |
System Design | Top Plate works in tandem with Top Clamp and Top Insert Sleeve |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 8th. 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 Top Plate - Ø 125 is an essential accessory for any chimney system using MI-FLEX 316 and 904 flexible flue liners. Reliable, robust, and designed to last, this component ensures your chimney's integrity and functionality. With our competitive pricing, nationwide delivery, and committed service to both retail and trade customers, National Flues is your dependable partner for all your flue and fireplace needs.
The Top Plate - Ø 125 is designed to securely support the weight of MI-FLEX 316 and 904 flexible flue liners at the top of a chimney stack, ensuring safe and effective operation.
National Flues is a leading supplier of fireplaces and flues across the UK, committed to providing high-quality products and reliable services to both retail and trade customers. With competitive pricing and nationwide delivery, we meet your fireplace and flue needs with unmatched expertise and efficiency.
