Free Delivery over £100+ 5on Trustpilot Browse our popular stoves Fast Mainland UK Delivery Buy stoves with install packs Call 01670 206 999 for help

Top Insert Sleeve - Ø 150 (20-150-PS)

For homeowners and professionals in search of high-quality chimney accessories, the Top Insert Sleeve Ø 150 from National Flues is a key component in ensuring a secure and efficient chimney installation. Read more...
Top Insert Sleeve - Ø 150
IN STOCK
Product Thumbnail
Now only £12.99
Give us a call if you find it cheaper and we'll normally price match.
  • Fast deliveryMonday, November 17th*
  • Best PriceCall us to beat any price you found online.
  • Secure checkoutCard· Google/Apple Pay· Klarna· Paypal

 

Payment Options

At a Glance

  • Secure fit for flexible chimney liners
  • Compliant with Building Regulations Document J
  • Suitable for wood, oil, gas, and smokeless coal appliances
  • Withstands temperatures up to 600°C (T600-rated)
  • Constructed from durable 316L stainless steel

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 Insert Sleeve Ø 150 is an essential component in the MI-FLEX range of chimney accessories. Specifically designed for use with MI-FLEX 316 and 904 flexible flue liners, this sleeve ensures a secure and stable fit at the top of your chimney. The product complies with Building Regulations Document J, requiring that flexible flue liners be enclosed within masonry chimneys, and supports appliances with temperatures up to 600°C (T600 designation).

Suitable for use with wood (less than 20% moisture), smokeless coal, gas, and oil appliances, the sleeve provides a reliable, durable, and weatherproof solution. When used in conjunction with the Top Plate and Top Clamp, it effectively distributes the vertical weight of the flue liner, maintaining the integrity of the chimney system. Easy to maintain, the system should be swept at least twice a year to ensure ongoing efficiency and safety.

SKU: 20-150-PS

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, November 17th. 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.

This is us — real advice over the phone, or at the counter, and real stock in our warehouse.

Customer being served at the National Flues trade counter
Trade counter Installer collection & same-day help.
Team helping customers at the counter
Advice Real people on the phone to spec the right parts.
Friendly member of the team at the front desk
Here to help Friendly, straight answers from HETAS approved experts.
Warehouse shelves with boxed flue components being picked for dispatch
Warehouse Orders picked & dispatched nationwide.
Talk to the team Visit our trade counter
Technical Specifications
SKU20-150-PS
ModelTop Insert Sleeve - Ø 150
Material316L Stainless Steel
DesignationBSEN 1856-2 T600 N1 W V2 L50012 G
SystemMI-FLEX Accessories MF20
Temperature RatingUp to 600°C (T600)
Fuel CompatibilityWood, Oil, Gas, Smokeless coal
ComplianceHETAS / CE & Building Regulations Document J
Before proceeding with the installation, ensure that your masonry chimney is both weatherproof and structurally sound. Clean the chimney thoroughly and inspect for any cracks or deteriorations. Install the flexible flue liner into the Top Insert Sleeve Ø 150, ensuring it fits snugly. For optimal performance, always use the Top Plate and Top Clamp in conjunction to evenly distribute the weight of the flue liner. It is essential to have your chimney system swept by a competent professional at least twice a year—once at the end of the heating season and again at the beginning—to maintain safe operation. Remember, no harsh chemicals or steel brushes should be used during cleaning to avoid damage.

The Top Insert Sleeve Ø 150 is used to maintain a secure fit for flexible chimney liners, ensuring that the weight of the flue liner is properly supported at the top of the chimney stack.

Yes, the Top Insert Sleeve Ø 150 is suitable for use on appliances up to 600°C, making it ideal for a variety of fuel types including wood, smokeless coal, gas, and oil.

Absolutely, the product complies with Building Regulations Document J, which mandates that flexible flue liners must be installed within masonry chimneys.

The system should be swept by a competent person at least twice a year, once at the end of the heating season and again at the start. This ensures that any deposits or blockages are cleared for efficient operation.

No, under no circumstances should chemical cleaners or mild steel tools be used. It is recommended to use appropriate tools and techniques provided by certified professionals.

Yes, the Top Insert Sleeve Ø 150 can be used with wood (under 20% moisture), smokeless coal, gas, and oil appliances.

Before installation, ensure your chimney is fully weatherproof and of sound construction. Any chimney pots should be in good condition without cracks, and appropriate flaunching should be made at the top of the stack.

 

Call the Experts   8am-5pm
👀 8 people watching this