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What is the 3–2–10 rule for fireplaces (chimneys)?

The 3–2–10 rule is a chimney height guideline (from NFPA 211) used to ensure safe venting and good draft. It states:

  • 3 feet: The chimney must extend at least 3 feet above the point where it passes through the roof.
  • 2 feet within 10 feet: The chimney top must be at least 2 feet higher than any part of the building (roof, dormer, parapet) within 10 feet horizontally.

Meeting this minimum helps the chimney clear nearby obstructions and roof turbulence, improving draft and reducing smoke blow-back and fire risk. Always follow your stove/flue manufacturer’s instructions if they require more height.

       ^  chimney top
       |     +2 ft above anything within 10 ft →
   ____|_______________________        ← 10 ft radius
  /    |      roof peak        \
 /_____|________________________\  ← roof line
      ↑
   +3 ft above roof where flue exits
    
The 3–2–10 chimney clearance concept.

UK note: The 3–2–10 rule is commonly cited in North America. In the UK, installers must comply with Building Regulations Part J and relevant standards/installer guidance for chimney/flue termination heights (e.g., ridge and separation rules). A HETAS-registered installer can size and site the flue to UK regs for your appliance and roof layout.

Sources: NFPA 211 / industry guidance on 3–2–10 clearance; UK Building Regulations Part J overview.

Getting the Fire Started

Kindling & Firelighters

Choose from our range of affordable firelighters and kindling (sticks). Use these to build your fire before adding kiln dried logs.

Products like Wood Wool Firelighters are designed to ignite very easily when presented with a burning match and softwood kindling combusts easily in the early stages of your fire creating the necessary heat to burn larger hardwood logs later on. Our kiln dried logs are perfect for use in wood burners, providing a clean and efficient burn.


Testimonials


First time buyer. Driver and office staff extremely helpful offering advice on benefits of burning different woods. Was kept informed as to date and time of delivery. Logs burn really well, and heat output from the Ash we bought is tremendous. Great product(s) and service. Will definitely be a second time (and subsequent) buyer.

5 Stars

I am really impressed with Logans Logs. I generally order online which is really straightforward. I placed my order several months ago when Logans had a sale on. The money doesn’t leave my account until the logs are due to be delivered. A delivery date was agreed. The driver turned up on time tipping the load onto a tarpaulin (in case it rained overnight). This tarp also made it easier to clean up my driveway of the little bits of wood and bark. Since I have been ordering from Logan’s Logs I have had no problems. The staff are lovely and friendly. I cannot fault the service I have received. I would highly recommend Logan’s Logs.

5 Stars

Excellent service, highly recommended. Delivery man went above and beyond, so kind and helpful.

5 Stars

Logos for Ready to burn scheme, trading standards, proper cornish business, BSL, FLOGAS, Cornwall Blood Bikes and Cornwall Chamber of Commerce