BE AWARE THAT MANUFACTURERS INSTRUCTIONS get-attachment    
  ARE ALWAYS TAKEN AS CORRECT    
  IN WHICH CASE THE CALCULATORS MAY NOT BE REQUIRED    
       
  1 SELECT THE TAB AT THE TOP VENTILATION OR     
    COMBUSTION OR PURGING ETC    
       
  2 FILL IN THE DETAILS IN THE YELLOW BOXES ONLY    
    IF INFORMATION IS PLACED IN A WRONG BOX THE PROGRAM    
    WILL TELL YOU    
       
  3 THE INFORMATION YOU REQUIRE WILL APPEAR IN THE     
    BLUE BOX    
       
    AIM TO PASS WITH GB GAS  
this is a free domestic gas calculator all calculations are deemed to be correct. Using this calculator will be covered by the disclaimer www.gb-gas.co.uk/disclaimer_5.html for more details
     
HEAT INPUTS          
  METRIC METER       IMPERIAL METER  
  AMOUT OF GAS        TIME FOR  (1FT3) ONE  
  USED IN TWO MINS       REVOLUTION IN SECONDS.
first reading          
second reading          
             
         
         
 
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GAS RATE   m3/hr
     
HEAT INPUT NET   kW
     
HEAT INPUT GROSS   kW
COMBUSTION PERFORMANCE ANALYSIS       
Co2 % Co PPM o2 %      
5      
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  AUTO co/co2 ratio      
OR 
  INSERT CO/CO2 RATIO      
BS 7967-3
APPLIANCE TYPE CO/CO2  RATIO    
Back boiler unit Boiler
In combination with fire
Central heating boiler  
Hot water circulator  
Flued space heater (check man instructions)
Flueless space heater  
Water heater flued and Flueless
Warm air heater  
Flueless cooker Oven
Hob Visual inspection of flames
Grill (CE marked)
Grill (No CE mark)
Range oven flued  
Refrigerator (LPG)  
Tumble drier Flued
flueless
Gas lights (LPG)  
       
         
  PURGING                   
  INSERT PIPE LENGTHS AND METER TYPE  get-attachment          
  Meter type G4 / U6 0.01      
  PUT AN X IN THE YELLOW BOX BESIDE THE METER TYPE U16 0.03      
    E6 0.0036      
  COPPER PIPE LENGTH IN M   STEEL PIPE LENGTH IN M    
  LENGTH 15mm 15mm     ½    
  LENGTH 22mm 20mm     ¾     
  LENGTH 28mm 25mm      1    
  LENGTH 35mm 32mm   1¼ 0    
INSTALLATION VOLUME m3
PURGE VOLUME m3
  Total installation volume   Total purge volume     
    or imperial  ft3    
 
 
  FLUED APPLIANCES                 VENTS WITH RECTANGULAR HOLES        
  HEAT INPUT IF MORE THAN ONE APPLIANCE IS FITTED ,INSERT THE TOTAL HEAT INPUT           HOLE SIZE 1 LENGTH (MM)   WIDTH (MM)   NO# OF HOLES    
  NET or            GROSS                
41.2
      TO OUTSIDE TOP VENT   BOTTOM VENT       HOLE SIZE 2 LENGTH (MM)   WIDTH (MM)   NO# OF HOLES    
  OPEN FLUED IN A ROOM         CM2            
  OPEN FLUED COMPARTMENT TO OUTSIDE     CM2     HOLE SIZE 3 LENGTH (MM)   WIDTH (MM)   NO# OF HOLES    
  OPEN FLUED COMPARTMENT VIA ROOM   CM2            
TOP VENT
BOTTOM VENT
  ROOM SEALED COMPARTMENT TO OUTSIDE     CM2       VENT SIZE     cm2    
  ROOM SEALED COMPARTMENT VIA ROOM     CM2                    
  DFE FIRES IN ON ROOM ENTER HOW MANY FIRES ARE FITTED IN THE SAME ROOM    
 
  CONSULT MANUFACTURERS INSTRUCTIONS **       CM2     LENGTH  
            WIDTH  
  FLUELESS APPLIANCES   OPENABLE WINDOW OR SIMILAR REQUIRED    
  COOKER ROOM VOLUME   m3           LENGTH  
  IS A DOOR TO OUTSIDE FITTED X FOR YES     CM2     WIDTH  
  FLUELESS WATER HEATER ROOM VOLUME m3          
              CM2    
  FLUELESS SPACE HEATERS CONSULT MANUFACTURERS INSTRUCTIONS **               VENTS WITH CIRCULAR HOLES      
  INSERT Kw OF THE APPLIANCE         HOLE SIZE 1 DIAMETER (MM) NO# OF HOLES      
  IN A ROOM MAX 45 W/m3 IN AN INTERNAL SPACE   MAX 90 W/m3   DOES IT CONFORM TO BS EN 449              
  CM2   CM2   X FOR YES            
VENT SIZE
cm2
  MULTIPLE APPLIANCES              
  Flueless space heating** open flued space heating** any other appliances      
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  CM2 CM2 CM2      
             
             
             
           
           
           
               
  VENT TO OUTSIDE SIZE REQUIRED       CM2      
  space heating is CH BOILER, WARM AIR HEATER, FIRE OR SPACE HEATER **        
                       
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