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Bosch Flue and Ventilation Quick Reference Guide 2022
Low level terminations – Compliance with the 'Clean Air Act'
IGEM/UP/10 (Edition 4) has given greater guidance on how to treat low level flue terminations up to 333kW input.
Essentially this involves three stages to confirm a termination position can be considered.
Is the gas input of the appliance or group of appliances within distance 5U from each other, less than 333kW net input? If not, the
1
position cannot be considered, and the flue must terminate above the building with Local Authority approval.
Are all the clearance requirements from the flue terminal position to openings, surfaces, boundaries, and internal spaces enclosed by
2
two or more vertical walls, met?
Carry out the risk assessment taken from appendix 9 of IGEM/UP/10 (Edition 4), (see example form below).
3
Does the risk assessment confirm the termination position is acceptable?
Risk Assessment - For low level horizontal flues – to meet IGEM-UP-10 (Edition 4).
Note: Please refer to the below for guidance on where to find the required figures within IGEM/UP/10 (Edition 4).
Figure 11B
– page 45 (distance Y from
Figure 12
– page 46 (formula to calculate distance G = 19.32 x Net head input (kW) +647.59)
5U the distance for GC 7000 WP appliances can be found on page 12 of this document.
Section 1
Type C (room sealed) appliances with net heat exceeding 70kW and not exceeding 333kW low level flue
discharge risk assessment, (including net heat input for groups of appliances).
FLUE POSITIONING
Is the proposed flue termination within the distance in figure 12 Line G of a road, path, track, thoroughfare, walkway, property boundary
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or area which is used for public access other than for maintenance purposes?
Is the proposed flue termination within the distance in figure 12 Line G to a playground, school yard, seating area, or area where there may be a public
2
gathering?
3
If the proposed flue termination enclosed on more than two sides, then does it comply with the requirements of Figure 11B?
4
Is the proposed flue termination within the distance in Figure 12 Line G of the proposed terminal position?
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Is the proposed flue position in an area where vehicles could be parked within distances from Figure 12 Line G to the flue?
6
Are there shrubs or trees within minimum distances shown on Figure 12 Line G of the proposed terminal position?
7
Is the proposed flue termination within a light well?
Are the products of combustion from the proposed flue position likely to build up under unfavourable atmospheric conditions, due to poor
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cross flow of air caused by enclosures or adjacent structures?
9
Is the flue termination position likely to cause a nuisance to adjoining properties?
BUILDING REGULATION'S PART J
Is the proposed flue termination less than 300mm form the boundary of the property, as measured from the side of the terminal to the
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boundary?
CLEAN AIR ACT
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Is the total output of individual, or group of flue terminals (if within 5U (see A3.7)), greater than 333kW net heat output?
Once the above risk assessment has been complete, the flue termination position is considered as:
If all the answers are NO (N) – flue position is suitable:
If any of the answer is YES (Y) – flue position is unsuitable:
Company name:
Gas safe registration number:
Engineer code:
Job number:
Customer first line of address:
Postcode:
Whilst it is always our intention to fully assist, it is essential to recognise that all information given by the company in response to an enquiry of any nature is provided in good faith and based
upon the information provided with the enquiry. We recommend that advice should always be checked with your installer or contract partner. Consequently, the company cannot be held
responsible for any liability relating to the use or repetition of such information or part thereof. In addition, whilst making every reasonable effort to monitor the performance and quality of
our supply, installation and service network, we do not accept responsibility for the workmanship or operation of any third party company that the company may have promoted either in
conversation, e-mail, or other communication. Similarly, the views and opinions expressed in communication with individuals within the company may not reflect that of the business as a whole.
You can find this, and all issued technical bulletins on the Worcester website at: worcester-bosch.co.uk/tb or worcester-bosch.ie/tb
Worcester, Bosch Group, Cotswold Way, Warndon, Worcester WR4 9SW Technical Services: 0330 123 3366 | technical-advice@uk.bosch.com
figure 5
above is used to assess this risk)
Engineer name:
Date:
Customer name:
NO
YES
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
NO
YES
N
Y
NO
YES
N
Y
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