Flue diameter for your pellet stove

Choose your stove, set out the route and see straight away whether ø80 will do or you need ø100 or larger. Calculated to EN 13384-1, at full and at low output.

1. Pellet stove

Brand

Model

2. Route

Flue outlet

Straight rise in the room (m)

Horizontal run to the chimney (m)

Through the wall or into the chimney. Always lay it rising slightly, 3 to 5 %.

Chimney

Chimney height (m)

From the tee at the bottom to the top.

Offset in the chimney

Cap on top

Drawing

Result

Flue diameter-

Diameter	Full	Low	Wall top	Verdict

Full and Low: draught left over in Pa (0 or more)Wall top: inner wall at the top, at low output

Total flue length, about
90° bends and tees

Site or customer (shown at the top of the sheet)

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Materials for your flue

Ask for a quote for this route Send us your route and we will quote for the materials.

How we calculate

The calculation follows the European standard EN 13384-1 for one appliance on a flue. It assumes:

the flue gas data of the stove manufacturer: flow, temperature and required draught at full and at low output;
a flue that gives the stove enough draught at both outputs, plus 4 Pa for the combustion air taken from the room;
if the twin wall flue runs through the house: also at least 4 Pa of negative pressure against the room;
a stainless steel flue with silicone seals (W, moisture resistant): the inner wall at the top must stay above 0 °C;
a tee with a cap at the bottom (inspection and cleaning), smooth bends of 90° and 45°;
an existing chimney: stainless steel liner in a masonry flue with a ventilated gap; twin wall: 25 mm insulation;
the resistance of the cap according to the manufacturers’ data: spark guard zeta 0.16, wind cowl 0.7, rain cap 1.0;
green only from 1.5 Pa of draught left over; between -1 and 1.5 Pa we call it tight;
the standard outdoor temperatures of the standard and no unfavourable wind zone around the top.

The result is a guide value for information. It does not replace a calculation for a specific house or an inspection on site. The stove manual and local rules always take precedence. Have the flue installed and checked by a professional. Ventichim only supplies the materials. No rights can be derived from this calculation.