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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.

All FAQs

What size logs should I buy for my stove?

For most UK wood burning stoves, logs around 8–10 inches (20–25cm) long are idea...

What log length do I need for a wood burner vs open fire?

For a wood burning stove, logs around 8–10 inches (20–25cm) are ideal. This size...

Which firewood is best for a small stove?

For a small stove, ash is usually the best all-round choice, with birch and oak used for differen...

Should I buy nets, barrow bags, or bulk bags?

It depends on how often you burn, how much space you have, and how much value you want.

N...

What’s the best value way to buy firewood?

The best value is almost always buying in bulk, as the price per cubic metre drops the more you b...

Why are kiln dried logs more expensive than seasoned logs?

Kiln dried logs cost more upfront because they go through a controlled drying process using heat ...

How long does it take for 1 log to burn?

The burn time of a log depends on the type of wood, its size, and how dry it is. Softwood logs su...

How long does firewood need to sit before burning?

Freshly cut logs known as green wood, contain a high amount of moisture, often 40–60% wa...

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 goo...

Is it legal to collect firewood in the UK?

In most cases, it is not legal to collect firewood from forests, parks, or countryside a...

How many logs per hour for a wood burner?

The number of logs you’ll burn per hour depends on several factors — including the size and effic...

How much firewood do I need per day?

The amount of firewood you’ll need each day depends on how often you use your fire, the size and ...

Is it cheaper to run a log burner than central heating?

In many cases, yes — a log burner can be cheaper to run than central heating, es...

How many logs do you need for winter in the UK?

The number of logs you’ll need for winter depends on how often you use your stove, how well your ...

How to light a fire properly?

Lighting a fire properly is all about using dry wood, creating good airflow, and building your fi...

Is kindling on top of bottom?

It depends on the method you use, but the most efficient and modern way to light a fire is the

How long should firewood be dried before burning?

Firewood needs to be properly dried before burning to ensure a clean, efficient and safe fire. Fr...

Is kiln dried firewood better than regular firewood?

Yes — kiln dried firewood is significantly better than regular (seasoned) firewo...

What are the disadvantages of dried wood?

Dried wood — whether seasoned or kiln dried — is the best type of firewood for clean, efficient b...

What is the difference between kiln dried firewood and seasoned firewood?

The main difference between kiln dried and seasoned firewood is how the moisture is removed and t...

Is it better to burn hardwood or softwood?

In most cases,

Are kiln dried logs environmentally friendly?

Yes — kiln dried logs can be environmentally friendly, provided they are sourced responsibly and ...

Is it ok to burn softwood on a log burner?

Yes - it is perfectly OK to burn softwood on a log burner, as long as the wood i...

What kind of wood should not be burned?

Not all wood is safe or suitable for burning. Some types can damage your stove, harm your health ...

Is it illegal to buy wet wood in England?

In many cases it is now illegal to buy wet wood in England, due to legislation i...

What does 1 cubic metre of firewood look like?

A cubic metre (1 m³) of firewood is simply a volume measurement — imagine a stack of logs that is...

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.

Logans does exactly what it says on the truck - supply kiln dried logs. We arranged for the logs to be stacked on delivery - which was done very neatly indeed. Guess where I'll go for my next kiln dried log delivery ?

5 Stars

Ken Gibbs

Great service and good quality logs :) It was a rainy day when my last delivery came and as it had to be left outside the driver took the trouble to leave a plastic sheet he had covering the logs. I was able to store nice dry logs the next day.

Lyn Trewella

great service and quality of logs good as usual

James Macintyre

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

What size logs should I buy for my stove?

What log length do I need for a wood burner vs open fire?

Which firewood is best for a small stove?

Should I buy nets, barrow bags, or bulk bags?

What’s the best value way to buy firewood?

Why are kiln dried logs more expensive than seasoned logs?

How long does it take for 1 log to burn?

How long does firewood need to sit before burning?

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

Is it legal to collect firewood in the UK?

How many logs per hour for a wood burner?

How much firewood do I need per day?

Is it cheaper to run a log burner than central heating?

How many logs do you need for winter in the UK?

How to light a fire properly?

Is kindling on top of bottom?

How long should firewood be dried before burning?

Is kiln dried firewood better than regular firewood?

What are the disadvantages of dried wood?

What is the difference between kiln dried firewood and seasoned firewood?

Is it better to burn hardwood or softwood?

Are kiln dried logs environmentally friendly?

Is it ok to burn softwood on a log burner?

What kind of wood should not be burned?

Is it illegal to buy wet wood in England?

What does 1 cubic metre of firewood look like?

Getting the Fire Started

Kindling & Firelighters

Kiln Dried Kindling

Firelighters

Testimonials