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The Clean Air Act

 

Monodraught have always maintained that the balanced-flue condition created by the system ensures higher efficiency from the appliance and by reducing the level of emissions of unburnt hydro-carbons and other preventable pollutants, airborne pollution can be reduced.

The most important aspect relating to terminal location is to ensure that the products of combustion cannot re-enter the building through any window or openings in such concentrations as could be prejudicial to health. Since, however, the Monodraught maintains a balanced-flue condition, the system is unaffected by "building effects". A balance-flue condition will always ensure optimum performance from the appliance regardless of external wind conditions.

In July 1993 a document was published by Her Majesty's Inspector of Pollution entitled "D1" which related to the control of polluting emissions mainly from process plant and other combustion processes, other than boilers serving space heating and hot water generation. The indications of this legislation is that the emissions from gas-fired plant is not considered a serious pollutant, but nevertheless, Monodraught still recommend the heights and distances to window openings as set out on the attached tables which is still based on the original, memorandum requirements.

GAS-FIRED

Assuming boilers operating at 80% efficiency

Boiler
Output

Minimum distance from flue discharge to open window
Minimum height above flat roof
Minimum height above intersection with pitched roof
150Kw
2.5m
1.0m
0.7m
200kW
2.95m
1.0m
0.7m
250Kw
3.4m
1.0m
0.9m
300kW
3.8m
1.0m
0.9m
400kW
4.5m
1.0m
0.9m
500kW
5.15m
1.0m
0.9m
750kW
6.55m
1.0m
0.9m
1000kW
7.75m
1.0m
1.0m
1250kW
8.9m
1.07m
1.07m
1500kW
9.9m
1.19m
1.19m
2000kW
11.8m
1.42m
1.42m

 

OIL-FIRED

Boiler
Output

Minimum distance from flue discharge to open window
Minimum Monodraught height above roof
-
28 sec oil
35 sec oil
28 sec oil
35 sec oil
150Kw
3.5m
6.5m
0.7m
0.80m
200kW
4.1m
7.5m
0.7m
0.90m
250Kw
4.6m
8.3m
0.9m
1.00m
300kW
5.0m
9.1m
0.9m
1.10m
400kW
5.8m
10.5m
0.9m
1.25m
500kW
6.5m
11.8m
0.9m
1.40m
750kW
7.9m
14.4m
0.95m
1.75m
1000kW
9.1m
16.6m
1.10m
2.00m
1250kW
10.2m
18.6m
1.25m
2.25m
1500kW
11.2m
20.3m
1.35m
2.45m
2000kW
12.9m
23.5m
1.55m
2.85m
Assuming boilers operating at 80% efficiency and that the installation is to take place in Area B - partially developed area.
Note: 35 sec oil Sulphur content = 0.2%, 28 sec oil = 0.06%
 

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