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Top Plate - Ø 300 (20-300-P)

The MI-FLEX Top Plate Ø 300 is a premium accessory built to support and secure your flexible flue liner installations. Engineered with precision and durability in mind, this top plate is an essential component for both domestic and trade chimney systems. Read more...
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At a Glance

  • Robust top support for MI-FLEX flue liners
  • Withstands temperatures up to 600°C (T600)
  • Suitable for wood (with ≤20% moisture), oil, gas, and smokeless coal
  • Made of durable GALV with a Natural/Stainless Steel finish
  • Complies with Building Regulations Document J for safe installations

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: sales@nationalflues.com

The Top Plate Ø 300 is an essential component for anyone installing MI-FLEX 316L and 904 flexible flue liners. Designed to provide robust support at the top of your chimney stack, this top plate works in conjunction with a Top Clamp and Top Insert Sleeve to safely bear the vertical (dead) weight of your flue liner. As per Building Regulations Document J, it is imperative that flue liners are installed entirely within a masonry chimney for safety and efficiency.

Suitable for use at up to 600°C (T600), the plate can be deployed on appliances burning wood (with less than 20% moisture), smokeless coal, gas, and oil. Ensuring a weatherproofed chimney stack and sound chimney construction are prerequisites for its installation.

SKU: 20-300-P

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.

About National Flues Ltd +

We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.

Technical Specifications
SKU20-300-P
MaterialGALV
Colour FinishNatural / Stainless Steel
DesignationBSEN 1856-2 T600 N1 W V2 L50012 G
SystemMI-FLEX Accessories MF20
Temperature RatingUp to 600°C (T600)
Fuel CompatibilityWood (with ≤20% moisture), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
- Ensure your masonry chimney is fully weatherproofed and structurally sound before installation. - Install the Top Plate Ø 300 within the chimney stack in compliance with Building Regulations Document J. - Use in conjunction with the Top Clamp and Top Insert Sleeve to safely support the vertical load of the flue liner. - Follow the manufacturer’s installation guidelines precisely to ensure safety and performance. - Regular maintenance is required; have your chimney swept at least twice a year by a competent professional. - Avoid the use of chemical cleaners and mild steel tools to maintain the integrity of the stainless steel components.

The Top Plate Ø 300 is compatible with MI-FLEX 316L and 904 flexible flue liners.

No, Building Regulations Document J specifies that flexible flue liners must be installed within a masonry chimney.

It is designed to withstand temperatures of up to 600°C (T600 designation).

It is suitable for use with wood (with less than 20% moisture), smokeless coal, gas, and oil.

Yes, regular maintenance and sweeping by a competent person are required. Chimneys serving solid fuel appliances should be swept at least twice a year.

No, chemical cleaners and mild steel tools should not be used for maintaining stainless steel chimneys.

Yes, the chimney stack must be fully weatherproofed and structurally sound before installation.

 

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