Below, we present several hints and considerations to keep in mind when maintaining your Jetmaster. 

General Hints

Jetmaster heat-resistant black touch-up paint is available direct or from distributors to keep your unit looking its best.

If the fuel you are burning tends to splatter, the use of a firescreen - and there is a Jetmaster screen available - is recommended.

It is essential before lighting the fire that a window or ventilator on the windward side be opened slightly to pressurise the room, ensuring the fireplace will not smoke and provide sufficients air to support combustion.

Chimney pots are frequently the cause of smoking problems. We therefore recommend rather the use of a Jetmaster chimney cowl to prevent downdraught.

Wet wood that is unseasoned or damp anthracite or coke will not burn efficiently and will more than likely cause smoking in excess of permitted emissions allowed in smoke-controlled zones.


Hardwoods are better for open fires than softwoods (pines, etc. which burn too fast and spit).  A split log will catch and burn better than a round log.  Wood should have been stored (seasoned) in a dry but ventilated place for a year before burning. Green (freshly cut) wood contains around 50% moisture.  Heat from the fire has to drive this off as steam before the wood can burn effectively.  This heat is lost in the formation of steam.  Apart from burning your wood in an efficient appliance, burning seasoned wood is the greatest step towards efficiency. Air-dried seasoned wood has about 20% moisture content; this reduction makes a tremendous difference to the heat output of the fire.

Note that the grate options for burning wood, coal or anthracite are removable and can be changed for the use of different fuels at any stage.

Please ensure that rotating cowl pin and bush are greased at least once prior to every winter season.

All steel exposed above roof level must be painted with enamel paint to minimise corrosion. This should be done once a year.


Gas is a very safe form of energy but, as with other fuels, must be treated with respect.  All Jetmaster Gas Grates in a standard installation and gas barbecues operate off low-pressure regulators.

To test that products of combustion do not enter the room, hold a lighted match directly above the fire box opening. If the match extinguishes, products of combustion are being drawn into the room.  This will cause a strong smell and could also be harmful to your health.  To correct, open damper slightly and if still not satisfactory check for chimney downdraught.

Only suitably qualified persons should install your gas burner.

Connecting and changing of cylinders should be carried out by a suitably qualified person.  Your local dealer will deliver and connect.

The SABS lays down specific regulations with regard to the installation and storage of gas cylinders. This information is available from our technical department.

All cylinders not in use or considered empty should have the valves tightly closed.

Operation of Jetmaster Fireplace Units(Solid Fuel):

Flue Damper Control:

NOTE:  Open  position of damper:

The damper control varies the size of the throat in the fireplace, serving two purposes:

Universal models - forward (handle L/H side)

  Provides control over the burning rate of the fire and therefore the consumption rate of the fuel.

Hex models - damper handle vertical (at rear of flue)

Reduces the heat-loss up the chimney, thereby improving efficiency.

Heron models - rear (handle middle)

The fire in the Jetmaster is lit with the damper fully open to promote maxinum draw from the fire.  When the fire is burning well, the damper can be closed down (using the poker provided) to a position that will allow the fire to burn a the diesired rate without smoking. This position will be determined by the draw on the chimney, the type and size of the fuel being burned and the desired size of the fire.

Because each chimney has its own peculiarities, the damper should be used as best suits your chimney.  It should never be closed so far as to cause the least trace of smoke in the room.


Lighting the fire (Solid Fuel):

a) Logpan models (for woodburning only):

Ensure that the logpan is right back against the backplate.

To lay the fire, crimple sheets of dry newspaper, place dry split wood criss-cross on top of the paper, leaving plenty of airspace between the pieces

NOTE:  A firestarter may be used in place of the above procedure

Before lighting, open damper fully (see above)

Light the paper or firestarter.

When the wood is burning well, close down the damper to a suitable position (refer above). When further refuelling is required it maybe necessary to open the damper.

IMPORTANT: Ash must be allowed to build up in the logpan to promote good burning and efficiency.  Removal of some of the ash is only necessary when spillage occurs. This will depend on the extent of usage of the fireplace but should not be more often than approximately every six weeks.

NOTE:  Use dry logs only

b) Basket grate and ashpan models:

Operation is the same as logpan models above, except that the ash needs to be removed as necessary by sliding out the ashpan from under the grate for ash disposal.  Allowing the ash to build up into the grate will cause the bottom of the grate to disintegrate over a period of time.

c) Superjet (rear blower) and jetgrate (portable front blower) models:

Ensure that grate is right back against the back-plate.

To lay the fire, crumple sheets of dry newspaper, place dry split wood criss-cross on top of the paper, leaving plenty of airspace between the pieces. DO NOT add anthracite or coke at this stage

NOTE:  A firestarter may be used in place of the above procedure.

Before lighting, open damper fully (refer above)

Light the paper or firestarter and switch on the fan

When the wood is burning well, slowly add fuel, limiting the quantity so that the flames are kept alive all the time.

With the grate fully fuelled and the fire burning brightly (after approx. 40 minutes), the fan can be switched off.  (Removed in the case of the Jetgrate to prevent heat damage).

At this stage the damper can be closed down to a suitable position (refer above).  when further refuelling is required, ensure that the fan is switched on and the damper opened.

If overnight burning is required ensure that the grate is fully fuelled and that the fan is switched off.  In the morning, start the fan, and when the fire is burning brightly, slowly add new fuel.

NOTE:  Use large nuts, Anthracite or coke.  Dry logs may also be used.


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All Contents Copyright © Jetmaster Webmaster: Celestine Ventures cc. Date of entry: November 1997   Latest Upload: 03 January, 1980

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