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Could someone please help me with this?

Could you explain what natural draught r/s means?
Fanned draught r/s?
Natural draught o/f?
Fanned draught o/f?

Ps. Flues are my weak point so any relevant information would be helpful.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Flue Categories
A, B, C - flueless, open flues, room sealed

1st digit - denotes method of arranging discharge of combustion
1 - with draught diverter
2 - with out draught diverter

2nd digit - denotes flue draught method
1 - natural draught
2 - fan downstream of heat exchanger
3 - fan upstream of heat exchanger
4 - fan downstream of draught diverter

Open-flued Systems
Open-flued systems


Category B

Balanced Compartments

Self-closing and draught proof door
Switch fitted to the door that turns off the appliance if the door is opened
Door shall not open into a bathroom
If over 12.7kW shall not open into bedroom
Keep closed notice on the door
No other ventilation into compartment
4 parts of an open flued appliance

Primary Flue

Part of the appliance
Creates the initial flue pull to clear the products of combustion
Draught Diverter
Diverts any down draught from the burner
Allows dilution of flue products
Breaks any excessive pull on the flue
Usually part of the appliance

Secondary Flue
Horizontal runs must be avoided
Bend minimum 45°
Keep internal where possible
Minimum 600mm vertical rise to the first bend
Cross sectional area of flue must be at least equal to that of the appliance

Terminal
Stop birds nesting or leaves entering the flue
Minimise down draught
Help the flue gases discharge
Terminals are not required for chimneys with a flue size greater than 170mm if no nesting will occur

Vertex Flue
Air supply taken from the roof space
Draught Diverter min height is 300mm above the loft insulation
The flue above the Draught Diverter must run for 600mm before any bend

Room-sealed Flue Systems

Room-sealed Flue Systems

Category C
Balanced (natural draught) flue
Fan-assisted flues
negative pressure within the casing
positive pressure within the casing
Termination options
Vertical room-sealed flue termination

Vertical room-sealed flue termination

all on google but you should have all this in your viper / niceic book
 
Flue Categories
A, B, C - flueless, open flues, room sealed

1st digit - denotes method of arranging discharge of combustion
1 - with draught diverter
2 - with out draught diverter

2nd digit - denotes flue draught method
1 - natural draught
2 - fan downstream of heat exchanger
3 - fan upstream of heat exchanger
4 - fan downstream of draught diverter

Open-flued Systems
Open-flued systems


Category B

Balanced Compartments

Self-closing and draught proof door
Switch fitted to the door that turns off the appliance if the door is opened
Door shall not open into a bathroom
If over 12.7kW shall not open into bedroom
Keep closed notice on the door
No other ventilation into compartment
4 parts of an open flued appliance

Primary Flue

Part of the appliance
Creates the initial flue pull to clear the products of combustion
Draught Diverter
Diverts any down draught from the burner
Allows dilution of flue products
Breaks any excessive pull on the flue
Usually part of the appliance

Secondary Flue
Horizontal runs must be avoided
Bend minimum 45°
Keep internal where possible
Minimum 600mm vertical rise to the first bend
Cross sectional area of flue must be at least equal to that of the appliance

Terminal
Stop birds nesting or leaves entering the flue
Minimise down draught
Help the flue gases discharge
Terminals are not required for chimneys with a flue size greater than 170mm if no nesting will occur

Vertex Flue
Air supply taken from the roof space
Draught Diverter min height is 300mm above the loft insulation
The flue above the Draught Diverter must run for 600mm before any bend

Room-sealed Flue Systems

Room-sealed Flue Systems

Category C
Balanced (natural draught) flue
Fan-assisted flues
negative pressure within the casing
positive pressure within the casing
Termination options
Vertical room-sealed flue termination

Vertical room-sealed flue termination

all on google but you should have all this in your viper / niceic book
Thank you for your help! Highly appreciated
[automerge]1591717469[/automerge]
Flue Categories
A, B, C - flueless, open flues, room sealed

1st digit - denotes method of arranging discharge of combustion
1 - with draught diverter
2 - with out draught diverter

2nd digit - denotes flue draught method
1 - natural draught
2 - fan downstream of heat exchanger
3 - fan upstream of heat exchanger
4 - fan downstream of draught diverter

Open-flued Systems
Open-flued systems


Category B

Balanced Compartments

Self-closing and draught proof door
Switch fitted to the door that turns off the appliance if the door is opened
Door shall not open into a bathroom
If over 12.7kW shall not open into bedroom
Keep closed notice on the door
No other ventilation into compartment
4 parts of an open flued appliance

Primary Flue

Part of the appliance
Creates the initial flue pull to clear the products of combustion
Draught Diverter
Diverts any down draught from the burner
Allows dilution of flue products
Breaks any excessive pull on the flue
Usually part of the appliance

Secondary Flue
Horizontal runs must be avoided
Bend minimum 45°
Keep internal where possible
Minimum 600mm vertical rise to the first bend
Cross sectional area of flue must be at least equal to that of the appliance

Terminal
Stop birds nesting or leaves entering the flue
Minimise down draught
Help the flue gases discharge
Terminals are not required for chimneys with a flue size greater than 170mm if no nesting will occur

Vertex Flue
Air supply taken from the roof space
Draught Diverter min height is 300mm above the loft insulation
The flue above the Draught Diverter must run for 600mm before any bend

Room-sealed Flue Systems

Room-sealed Flue Systems

Category C
Balanced (natural draught) flue
Fan-assisted flues
negative pressure within the casing
positive pressure within the casing
Termination options
Vertical room-sealed flue termination

Vertical room-sealed flue termination

all on google but you should have all this in your viper / niceic book
Could you please provide the link to this page?
 
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