12
STRATA1
13.0 room sealed
flue installations
The Strata 1 boiler has an excess pressure combustion system, which coupled with the very low flue
gas temperatures produced allows the appliance to be exhausted and supplied with room sealed
combustion air using a concentric flue arrangement of 80 mm PPS polypropylene flue pipe within a 125 mm
outer painted metal air tube over considerable distances. A range of concentric flue components are
available from MHS Boilers Ltd and are listed below. Alternatively, two seperate tubes, one carrying
combustion air and one carrying flue gas may be used in conjunction with the appropriate adaptor.
The concentric flue system should be installed to have at least a 3° fall to the boiler to allow any
condense formed in the flue to run back to the boiler.
The flue system must be gas and water tight and must be adequately supported over it’s entire length.
Support at 1.5m intervals. Horizontal Discharge and Vertical Discharge Terminal Sets are available.
Care should be taken when selecting a position for a low level discharge or discharge adjacent to
windows etc as the flue terminal will plume heavily and the white water vapour discharge may cause a
visual nuisance.
Concentric flue components have push together spigot and socket joints. The inner PPS flue gas tube
has seal rings located in the socket component. The outer air tube has EPDM rubber seal rings located in
the socket component.
To aid assembly and assurance that the joints have been fully pushed home, the seal rings and make
ends of tubes/fittings should be lightly lubricated with silicone grease.
list of concentric flue components
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80/125 Concentric wall terminal set:- comprises 500 mm (845 mm*) straight length with made on
terminal, 90° concentric bend and wall bezel plates.
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80/125 Concentric roof terminal set:- comprises 1000 mm straight length with made on terminal and
1Nr 125 wall bracket.
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125 pitched roof tile flashing for use with concentric roof terminal set, adjustable between 25° to 50°.
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125 flat roof flashing for use with concentric roof terminal set.
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80/125 Concentric flue tube set x 1000 mm.
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80/125 Concentric flue tube set x 500 mm.
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80/125 Concentric 93° Bend.
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80/125 Concentric 45° Bend.
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125 Wall bracket assembly.
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80/125 Concentric Vertically Extendable Discharge Room Sealed Wall Terminal Assembly - For use
where a standard wall terminal may cause visual flue gas pluming nuisance. Includes 90° Concentric
bend, wall bezel plates and silicone mastic. Used in conjunction with additional 80 mm pps flue gas tube
and fittings listed on page 10.
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80/125 Concentric to 2 x 80 mm Separate Tubes Adaptor.
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80/125 to 100/150 Concentric Increaser (Not Shown).
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100/150 Concentric Wall Terminal (Not Shown).
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100/150 Concentric Roof Terminal (Not Shown).
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100/150 Concentric Flue Tube Set x 1000 mm (Not Shown).
●
100/150 Concentric Flue Tube Set x 500 mm (Not Shown).
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100/150 Concentric 93°C Bend (Not Shown).
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100/150 Concentric 45°C Bend (Not Shown).
