Wood fires & Coal fires:
Buyer’s guide and specifications

Contents
 
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Choosing a Universal Convector Fire

The table (below) will help you choose the most suitable size of fire.

  1. Decide the largest fire that your fireplace opening (which may be enlargeable) and your chimney will allow.
  2. Decide the smallest fire capable of heating the room on its own, with your choice of fuel (see table above).
  3. Within this range, decide which size best complements the aesthetic proportions of the room.
  4. If burning wood, and particularly if you may want to burn wood overnight, we recommend a fire capable of burning sizeable logs.

Making sure you have the correct air supply

Current Building Regulations require that a room has an air supply. You may require additional permanent ventilation to comply with the building regulations and to help remove smoke and flue gas to make the fire burn more effectively.

A new source of air supply will be needed where a room has been double glazed or well sealed in some other way.

The size of chimney you will need for your fire to work properly

Jetmaster fires are designed to ensure that smoke and flue gases are cleared properly and effectively. It is therefore vital that you choose the right size fire for your chimney. The specifications chart shows the recommended and minimum flue sizes as well as the chimney height required. If you have an existing chimney you will need to measure:

  1. The internal size of the flue at its narrowest point – either the diameter if it is circular or the length of its sides if it is square.
  2. The height from the top of the fire opening to the top of the flue.

If you are building a new chimney, ensure that it is designed to meet our recommended flue dimensions as well as current Building Regulations.

 
Wood tray and log retainer

Wood Tray and log retainer

This is for burning wood only. It consists of a tray and a log retainer. The tray is designed to hold a good bed of ash, and the grid to prevent logs rolling forward. The retainer is detachable from the tray to make it easier to remove the ash. Log retainers are supplied in cast iron or steel for sizes up to E700 and in steel only for the larger fires.

 
Coal, Smokeless fuel and Wood basket grates

Basket grates

These grates are designed to burn coal, smokeless fuels or coal and wood mixed together. The basket is made up of 12mm steel bars with a drop in cast iron bottom grid and each grate is supplied with an ashpan, with carrying handle, made of sheet steel. Replacement bottom grids and a gas conversion are available.

 
Arched steel lintels

Arched Lintel

This is a curved lintel made of steel, which bolts on to the fire unit and converts the basic square shape of the fire into an arch. It is fitted during the construction of a new fireplace, beneath the main structural lintel. It can be used to support the weight of a few courses of brick or similar material if necessary.

 
Firescreen frames

Firescreen

This clips on to the frame of the fire. It is made from fine mesh steel in a steel frame and prevents sparks and embers falling out of the fire into the room.

Note: Not all accessories are suitable for all fire units. Please consult the accessories/grates chart.

 
Wood, Coal frames with fireguard and woodtray

The Frame

The Frame can be fitted to either a 600 or 700 Universal or 18″ and 22″ gas convector. The frame comes complete with fireguard and woodtray in the Universal version.

As The Frame still convects heat, you will need at least a 75mm gap between the frame and hearth.

To Fit Fire Size Dim. A Dim. B Dim. C
Universal 600 934 670 55
Universal 700 1034 670 55
18″ Convector Mk6 737 597 55
22″ Convector Mk6 814 597 55
 
 
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Models

 
The Standard fireplace model

The Standard

The Standard comes in two models – the 16″ and 19 ″, which are designed to fit British Standard Fireplace openings of 16″ × 22″ and 18″ × 22″.

Universal and the Extra fireplace models

The Universal
& The Extra

The Universal models come in three sizes – the 500, 600 and 700, each with a firebox height of 630mm and a depth of 355mm. The Extra models are three larger sizes, the 700, 850 and 1050, each higher and deeper in proportion.

The Low fireplace model

The Low

The Low fires also come in three sizes – the 500, 600 and 700, each with a firebox height of 530mm and a depth of 355mm. Designed for low lintel or existing short chimney installations.

Double-sided fireplace model

The Double Sided

Available as a 700mm and 1050mm to special order.

 
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Frame, Firebox & Model specifications

Compare the A to E values in the table below with the diagrams in the models section above.

  Standard Universal Low Extra Double Sided
  16″ 18″ 500 600 700 500 600 700 700 850 1050 700 1050
Frame
mmWidth A 453 503 600 700 800 600 700 800 800 950 1150 800 1150
insWidth A 17 ¾ 19 ¾ 23 ⅝ 27 ½ 31 ½ 23 ⅝ 27 ½ 31 ½ 31 ½ 37 ½ 45 ½ 31 ½ 45 ½
mmHeight B 576 576 650 650 650 550 550 550 700 750 800 700 770
insHeight B 22 ⅝ 22 ⅝ 25 ⅝ 25 ⅝ 25 ⅝ 21 ⅝ 21 ⅝ 21 ⅝ 27 ½ 29 ½ 31 ½ 27 ½ 30 ⅜
Firebox
mmWidth C* 398 448 550 650 750 550 650 750 750 900 1100 860 1210
insWidth C* 15 ⅝ 17 ⅝ 21 ⅝ 25 ⅝ 29 ½ 21 ⅝ 25 ⅝ 29 ½ 29 ½ 35 ½ 43 ⅜ 33 ⅞ 47 ⅝
mmHeight D 549 549 630 630 630 530 530 530 680 730 780 680 750
insHeight D 21 ⅝ 21 ⅝ 24 ¾ 24 ¾ 24 ¾ 20 ⅞ 20 ⅞ 20 ⅞ 26 ¾ 28 ¾ 30 ¾ 26 ¾ 29 ½
mmDepth E 350 350 355 355 355 355 355 355 405 455 505 600 600
insDepth E 13 ¾ 13 ¾ 14 14 14 14 14 14 16 18 20 23 ⅝ 23 ⅝
Model
Opening NeededmmWidth 407 457 580 680 780 580 680 780 780 930 1130 870 1220
insWidth 16 18 22 ⅞ 26 ¾ 30 ¾ 22 ⅞ 26 ¾ 30 ¾ 30 ¾ 36 ⅝ 44 ½ 34 ¼ 48
mmHeight 559 559 635 635 635 535 535 535 685 735 785 685 755
insHeight 22 22 25 25 25 21 21 21 27 29 31 27 29 ¾
mmDepth 356 356 365 365 365 365 365 365 415 465 515 600 600
insDepth 14 14 14 ⅜ 14 ⅜ 14 ⅜ 14 ⅜ 14 ⅜ 14 ⅜ 16 ⅜ 18 ⅜ 20 ⅜ 23 ⅝ 23 ⅝
Room Size Heated  Cubic Metres 57 70 130 150 170 70 130 150 175 200 250 180 210
 Cubic feet (x 1000) 2.0 2.45 4.4 5.1 5.8 2.45 4.4 5.1 5.9 6.8 8.4 6.1 7.1
Average Output to Room kWWood 2.9 3.6 6.5 7.5 8.5 5.0 6.5 7.5 9.5 14.9 †17 †17 †20
kWCoal 3.8 4.1 6.7 7.6 8.6 5.3 6.7 7.6 8.7 13.1 †15 †15 †18
kWSmokeless Fuel 2.9 3.2 5.1 5.8 6.6 4.0 5.1 5.8 6.7 10.1 †12 †12 †14
Recommended Flue mm int.Square 185 185 185 185 200 185 185 185 200 250 300 300 350×500
ins int.Square 7 ¼ 7 ¼ 7 ¼ 7 ¼ 8 8 7 ¼ 7 ¼ 8 10 12 12 14×20
mm int.Round 180 200 200 200 200 200 200 200 225 250 300 350 -
ins int.Round 7 8 8 8 8 8 8 8 9 10 12 14 -
Minimum Flue mm int.Minimum flue round 155 180 180 190 200 180 185 190 225 250 300 350 -
ins int.Minimum flue round 6 7 7 7 ½ 8 7 7 ¼ 7 ½ 9 10 12 14 -
cm2Minimum flue area 190 250 250 285 315 250 267 285 366 507 730 900 1750
ins2Minimum flue area 30 38 38 44 50 38 42 44 57 79 113 144 280
PaMinimum flue draught 10 10 10 10 - 10 10 - - - - - -
Chimney Height cmAbove Fire 4.6 4.6 5.5 5.5 5.5 5.5 5.5 5.5 5.5 6.0 7.2 5.5 6.0
ftAbove Fire 15 15 18 18 18 18 18 18 18 20 24 18 20
cm2Air Supply 170 170 230 230 230 230 230 230 230 350 500 230×2 500×2
ins2Air Supply 26 26 36 36 36 36 36 36 36 55 78 36×2 78×2

* = Damper and friction bar bolt heads extend beyond this dimension
† = Estimated

 
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Outputs, Efficiency & Temperatures

  Standard Universal Low
Wood Tray with Wood 16 18 500 600 700 500 600 700
Room Size Heated M3 57 70 130 150 170 70 130 150
Heat Output to Room WoodKw
(Tested to BS3250)		 2.9 3.6 6.5 7.5 8.5 5.0 6.5 7.5
Total Nominal Heat Output WoodKw
(When tested to EN13229:2001)		 5.5 8.5 15 20 - 15 20 -
Net Efficiency Wood%
(When tested to EN13229:2001)		 49.7 ≥46.7 ≥46.7 46.7 ≥46.7* ≥46.7* ≥46.7* ≥46.7*
Flue Gas Temperature°C
(When tested to EN13229:2001)		 187 <380 <380 380 - - - -
Flue Gas Mass Flowgs-1
(When tested to EN13229:2001)		 28.9 - - 61.9 - - - -
Mean CO2 in Flue Gas%
(When tested to EN13229:2001)		 2.42 - - 5.12 - - - -
Mean CO @ 13% O2%
(When tested to EN13229:2001)		 0.35 0.35 0.35 0.17 - - - -

* = Estimated figures