Twin wall insulated venting system specifically designed for residential and small commercial kerosene (28 second oil) and gas appliances. Especially useful on exposed external runs or cold roof spaces. BS5440-1-2000 5.1.7 requires the use of stainless steel insulated flue on all exterior gas flue runs exceeding 3 metres. K Vent fulfills this requirement and interconnects directly with the B Vent gas flue system for the most cost-effective solution
K Vent is suitable for appliances that operate with a flue gas temperature that does not exceed 250°C. K Vent is only suitable for appliances that operate zero or negative pressure at the appliance outlet. For appliances that operate outside these conditions please refer to other products in the range or contact us.

● Twist-lock bayonet jointing system.
● No locking bands required.
● Corrosion resistant laser-welded 304 stainless steel liner.
● The case in aluzink which may be painted if required.
● The 12.5 mm high efficiency SuperwoolTM blanket maintains the flue gas temperature, maximising efficiency, improving flue draught on start-up and minimising condensation.
● Low external case temperature.
● The liner held rigidly by the male locking collar but free to expand and contract with temperature change through the female collar.
● When joint is made, the liner covers the jointing collar, shielding it and permitting easy drain-down of any condensate in the flue.

Flue size selection

K Vent is available in 100, 125 and 150mm internal diameters. The flue size must be as recommended by the appliance manufacturer and must not be reduced, and never smaller than the appliance spigot. This information is provided as a guide only, and for exact flue sizing recommendations, refer to appliance manufacturer’s installation instructions and design guide.

Adjustable Pipe

Effective Length Range 40-245mm Slide over male of pipe below. Take out insulation strips as required. Tighten jubilee clip. Min. 40mm overlap. Do not use after bend or tee since insufficient overlap.
Use of a pipe and an adjustable length immediately above the appliance enables removal of the appliance later without dismantling the full system. All pipe lengths and flue gas carrying components are joined together by a twist lock, bayonet system. The system should be installed with the visible male collar pointing upwards, this is reaffirmed by the directional arrow pointing upwards, indicating the directional flow of flue gases. Taping of joints is unnecessary. B Vent is for atmospheric appliances which have negative pressure flues meaning that when the system is primed and running at normal operating temperatures, air is drawn into the flue via the joints, assisting safe evacuation of flue gases.