Twin wall gas heating system designed for cost-effective venting of residential and small commercial atmospheric gas appliances with input up to 60kw. It is suitable for both internal and external use, either as a complete system or in combination with masonry, i.e. flue blocks or brick chimneys.
Note that BS 5440-1 requires the use of a stainless steel insulated flue on external runs exceeding 3 metres. K Vent fulfills this requirement and is fully interchangeable with the B Vent range.

■ Twist-lock bayonet jointing system.
■ No locking bands required.
■ Aluminium inner liner and aluzink outer case which can be painted if required.
■ 12.5 mm air gap between case and liner keep case temperature low.
■ 0-90° adjustable bend.
■ When joint is made, the liner covers the jointing collar, shielding it and permitting
easy drain-down of any moisture in the flue.

Flue size selection

B 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.

Vitreous Enamel Connector

Always use an appliance connector, sealed using fibre rope and fire cement or high temperature sealant. The liner should not project below the appliance outlet spigot and can be cut to length if required.