Biomass Flue System

Grant wood pellet boilers have their own unique high temperature flue system. This 125mm (5”) vertical conventional stainless steel, twin wall insulated chimney system specifically designed for use with Grant pellet boilers. It has been fabricated to cope with continuous operating temperatures up to 200°C although the typical flue gas temperature produced by the Spira is much lower than this. The system is designed so that the stainless steel outer case is load bearing and stainless steel inner liner is free to expand independently to accommodate temperature change.

Available with a range of extension pieces and bends in a black or white finish, the system can easily be assembled to suit a wide variety of installations.

Assembly

Sections are joined together by placing the female collar of one section over the corresponding male collar of the preceding section then locking by rotating the upper section clockwise. It is vital that all flue gas carrying components are installed with the external collar pointing upwards. An arrow on the label indicates the flue gas direction.

The inner of each section is enlarged at the male end so that the female end of the other section or fitting enters into it and overlaps. This allows any condensation to run back to the boiler without escaping from joints.

Runs

The flue should remain as straight as possible through its vertical run to assist flow. Should it be necessary to angle the run, an offset no greater than 45° to the vertical, with a run between the bends not exceeding 20% of the overall height of the chimney should be maintained. A vertical rise of 600mm should be allowed immediately above the appliance before any offsets. Reference for both guidelines can be found in the Building Regulations Document J and relevant British Standards on installations.

Features

  • Twist-lock bayonet jointing system. Secured by locking bands
  • Advanced corrosion resistant design and construction
  • The 25mm high efficiency Superwool blanket maintains flue gas temperature, maximising efficiency, improving flue draught on start up and minimising condensation.
  • Low external case temperature.
  • Inner liner held by the male locking collar but free to expand and contract with temperature by up to 18mm through the female collar.
  • The inner liner has an inward bead at the female end which acts as a capillary break preventing moisture beingdrawn through the joint.

Case Studies

Martin Roberts warms up with a Grant VortexBlue

Earlier this year, television and radio property expert and author, Martin Roberts, turned to Grant UK for a replacement oil boiler to fulfil his property’s heating needs. Martin selected a Grant VortexBlue which, with its cleaner burning technology, is now keeping his home warm and toasty for many years toRead More

Green heating for 18th century estate

A historic Derbyshire country house, set in over 300 acres of trees and parkland is captivating visitors with its green approach to heating, by prominently displaying Grant Renewables in its gardens.  The magnificent family owned Locko Estate is the current ancestral home of the Drury-Lowe family.  It dates back toRead More

Primary school cuts costs with Vortex boiler house

Crowenstown National School, one of the oldest primary schools in Ireland, founded in 1841, has installed the very latest Grant Vortex Pro Condensing boiler house boiler, to help cut energy costs. The original building was demolished in 1938, replaced with the current school which has three classrooms, a staff roomRead More

Grant biomass boilers are keeping installers busy

The social media feeds of Dryad Energy Ltd have been filled with red recently – red Grant Spira biomass (wood pellet) boilers! Dryad Energy has been incredibly busy installing Spira boilers in domestic properties throughout the South with photos from these installs occupying their newsfeeds. We have been speaking toRead More