How to Diagnose Your Smoking Fireplace Problem

t is important to understand that there is a balance between the  Fireplace opening size , Flue dimensions , Chimney height,  and Air supply. 
There may be more than one factor affecting this  balance and causing  smoking! 

Getting Started  
The following is a very simple  'Two Stage'  method we always use when investigating a flue system:
 
Tools required;

1. A light weight thin cotton sheet like a bed sheet large enough to cover the fireplace opening
2. Ordinary household cooking tin foil and tape (we normally use Duct tape)
3. A torch and kindling wood

Stage 1
The Draw Test
Examines degree and strength of air movement into the fireplace and the possible reasons for failure 

Stage 2
The Tinfoil Test    
Examines the effect of restrictions in the flue, air starvation plus any incorrect proportions between the flue height, internal size and fireplace  opening

Each stage will give us information which should  allow us to establish where the problem lies. 
The sections on Restrictions, Chimney pots, Ventilation problems, Air starvation, Down draft, and Flue sizing  provide information  relating to the two main stages and for your assistance to understand our terminology there are links, photographs and examples through out.

There are going to be scenarios that the tests don’t cover and this site is intended to show you just the basics so that you are better informed when consulting an engineer.
     


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Please note:
​If you have recently purchased your property or opened up a fireplace which has not been used by you then only the ‘Draw Test ’can be carried out prior to a camera survey or sealed smoke testing to make sure the flue system is 'fit for purpose'. 
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Click here to go to Appendix E, Part J Building Regulations 2010 and note the rear of the publication for more detailed information.