HHSRS VERSION 2

SEPTEMBER 2004

NITROGEN DIOXIDE

Vulnerable age

Related hazards

All ages

Carbon Monoxide, Fire

HHSRS VERSION 2

Multiple locations

Yes

No

Secondary hazards

Yes

No

Front elevation

Rear elevation

A) Cooker to first floor front right, bed-sitting room

DESCRIPTION OF HAZARDS

Dwelling: Non-self contained flat in 1900's converted house (HMO)

Background: This is the rear first floor bed-sit in a four storey mid terraced house (including attic

and basement) that has been converted into four non-self contained units. The house is located in

an inner city area where there are many similar HMOs. Entry to the flat is from a common staircase

and landing. There is a shared bathroom on the first floor.

Gas Cooker: The gas cooker to the first floor rear bed-sitting room is situated in the rear corner of

the room and together with an adjacent small sink and one kitchen unit constitutes the kitchen

amenities for the accommodation. The cooker which has a high level grill is old and burns with a

reddish flame. The only means of ventilation to the room is the openable double hung sash window.

There is no permanent ventilation.

Pre 1920 non s.c. flat

A

-

Seriously defective

Defective

Not satisfactory

Satisfactory/NA

# Secondary hazards

-

None

Key

3

2

1

-

LIST OF RELEVANT MATTERS

LIKELIHOOD & OUTCOMES

A

1

Open flued appliances

-

a

Flueless appliances

3

b

Disrepair to appliance

3

c

Inadequate ventilation

3

d

Disrepair to ventilation

-

e

State of flues

-

f

Disrepair to flues

-

g

Flue outlet siting

-

h

Extractor fans

3

i

Ventilation lobby

-

j

CO Detectors

2

Likelihood to

1 in 560

Outcomes to

0.0

0.1 10.0 89.9 %

At the least, the gas cooker should be replaced with an electric cooker, and an extractor

fan fitted to improve ventilation. Ideally, however, a kitchen should be relocated in a

separate room which should be provided with permanent means of ventilation. This

latter option would reduce the risk to average or better.

Improved

IMPROVE

Justification

NEW RATING

Av: Nos

A B C D E F G H

I

J

Average likelihood, outcomes and HHSRS score for oxides of nitrogen for all persons in pre

1920 houses in multiple occupation (HMOs).

Score:

7

HHSRS VERSION 2

SEPTEMBER 2004

HEALTH AND SAFETY RATING SYSTEM SCORES

LIKELIHOOD

Low

High

Average: 513

1 in

3

Example

3

< 4200 2400 1300 750 420 240 130

75

42

24

13

7.5

4

2.5

1.5 >

Justification

OUTCOMES

Class I

Class II

Class III

Class IV

Justification

RATING

The gas cooker provides the only means of cooking for the bed-sit, and is in fairly regular

use (as is apparent from the stained adjacent walls). In use, combustion products spill

into the room and, without permanent means of ventilation, Oxides of Nitrogen

accumulate in the room, particularly in winter when the only window is kept permanetly

closed. As the room is used for both living and sleeping, there is no escape from the

effects of these products.

%

Average: 0.0

0.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 0.1

0.1

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 9.1

10.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 90.8

89.9

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

0.0

0.1

10.0

89.9

There is nothing to indicate that the outcomes would be other than the average.

However, with the high likelihood this still gives an HHSRS score of 1333 and a Band C

rating.

Average: 7

A B C D E F G H

I

J

1333

Score

RATING SCORES AFTER IMPROVEMENT