Grün Engineering

Photo library

What it looks like

Real photos from Grün jobs, sorted by the part of the job people ask about. Tap any photo to see it larger.

62 photos in five parts

01 · 14 photos

Roof finishes and terminals

This is the part people see from outside. Where a flue passes through a roof, a flashing or weathering plate seals the hole so rain stays out.

At the top, the terminal lets the gases out. Some have a cap or mesh to keep out rain, birds and leaves. Others run straight up, clear of the roof, or finish on a wall.

  • Hilton Garden Hotel, Heathrow, boiler flue terminal Terminal and flashing plate on a flat roof, set back from the edge guardrail.
  • Factory, Derby, boiler flue terminals Terminals with new flashings on a profiled metal roof.
  • Factory, Derby, boiler flue terminals Five terminals in a row on a standing seam roof.
  • Factory, Derby, oven flue terminals Two oven flue terminals through a corrugated factory roof.
  • London Business School, London, generator exhaust terminal Polished terminal with a storm collar where it meets the roof.
  • Walthamstow Academy, London, boiler flue terminals Two boiler flue terminals above the roofline at dusk.
  • Walthamstow Academy, London, twin wall boiler flues Twin flues rising above the plantroom roof at the back of the building.
  • Factory, Annesley, process exhaust risers Two exhaust risers on wall brackets, finishing above the parapet.
  • Factory, Annesley, process exhaust terminals Exhaust terminals just above a louvred plantroom wall.
  • Barrow Crematorium, Barrow-in-Furness, cremator flue stack Finished stack with its weathering plate on a flat roof.
  • Preston Hospital, Preston, generator exhaust Generator exhaust stack rising from a silencer on top of an acoustic enclosure.
  • Salmon farm, Applecross, generator exhaust stacks Four generator exhaust stacks above the plant building at dusk.
  • Duffield Bank House, Derby, boiler flues Two flues on brackets up a brick gable, finishing above the roof edge.
  • Trafford Hospital, Manchester, twin wall boiler flues Two twin wall flues bracketed off the plantroom wall above a louvred screen.

02 · 16 photos and a mast to follow

Base supports and steelwork

A flue is heavy, and it grows and shrinks as it heats up and cools down. It has to be carried at the bottom and held on the way up.

That can be a floor stand, brackets fixed to a wall, or a steel frame. Frames on rubber feet sit on top of the roof finish. Bigger stacks get braced frames.

  • DVLA, Swansea, flue support frames Three flues held in galvanised steel frames on a flat roof.
  • DVLA, Swansea, flue support frame Channel steel frame on rubber feet around a single flue.
  • DVLA, Swansea, flue support frame Braced frame around two flues, seen close up.
  • DVLA, Swansea, twin wall boiler flue Tall terminal held in a braced frame in front of the office tower.
  • Hillingdon Civic Centre, Hillingdon, generator exhaust support Channel frame beside a silencer, carrying the generator exhaust up and clear.
  • Salmon farm, Applecross, silencer support frame Galvanised frame carrying a large exhaust silencer above the generator.
  • Factory, Derby, air handling unit flue Floor-standing frame under a flue rising from an air handling unit.
  • Factory, Derby, oven flue Oven flue, elbow and riser fixed to a steel column.
  • Factory, Derby, oven flue Oven flue riser supported off the building steelwork inside the hall.
  • Walthamstow Academy, London, boiler flue risers Two risers on wall brackets up a rendered wall to the roof.
  • RAF Marham, Marham, twin wall boiler flue Twin wall riser on cantilever brackets up a brick plantroom wall.
  • RAF Marham, Marham, boiler flue risers Two risers on brackets up the side of the building, beside the old stack.
  • Royal Orthopaedic Hospital, Watford, twin wall boiler flue Flue out through a wall plate, then up the brick wall on brackets.
  • Barrow Crematorium, Barrow-in-Furness, cremator flue stacks Two stacks on support plates, with the horizontal runs feeding in.
  • Barrow Crematorium, Barrow-in-Furness, cremator flue supports Roof route with the elbow and stacks supported beside the old brick chimney.
  • Ibstock Community College, Ibstock, flue support frame Channel steel frame holding a flue stack against the side of the building.
  • Mast photo to follow
    Mast photo to follow Finished mast photo to be added.

03 · 16 photos

Plantroom headers and connections

Inside the plantroom, each boiler or generator connects into the flue. Where several boilers share one flue, they join a common pipe called a header.

Low points have a drain so condensation can run away. Test points are small capped ports used to check the flue gases. Generator exhausts usually have a silencer in the run.

  • Walthamstow Academy, London, boiler flue header Header and branches at high level above the boilers.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, condensing boiler flue header Single wall header running above three boilers.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, condensing boiler flue Boiler connections rising into the header.
  • Reading Hospital, Reading, twin wall boiler flue header New twin wall header with tees above the boilers, tied into the existing riser.
  • Rhigos Care Home, Rhigos, boiler flue header Header connecting two wall-hung boilers.
  • Queens Hotel, Leeds, twin wall boiler flue Tee and elbow connecting a new boiler in a basement plantroom.
  • Factory, Ashford, twin wall boiler flues Boiler flues with offsets and a drain section at the low point.
  • Currock Community Centre, Carlisle, boiler flue Base of a flue with two capped test points and a drain connection.
  • Valley Academy, Worksop, twin wall boiler flue Riser with an offset, passing up through the plantroom ceiling.
  • Factory, Annesley, process exhaust Exhaust connections off two air handling units.
  • Salmon farm, Applecross, generator exhaust Insulated flexible connection from the generator up to the main silencer.
  • Salmon farm, Applecross, insulated generator exhausts Four insulated exhaust runs at high level in the generator room.
  • Salmon farm, Applecross, generator exhausts and silencers The generator room with exhausts and silencers in place.
  • London Business School, London, generator exhaust silencer Silencer hung from the soffit on threaded rods, with a flanged joint.
  • London Business School, London, generator exhaust silencer Horizontal silencer hung from the ceiling on channel and rods.
  • Factory, Derby, oven flues Three oven flues running across the roof space, then up.

04 · 9 photos

Chimney tops and liner details

Lots of older buildings already have a brick chimney. Often it can be lined: a stainless liner goes down the inside and connects to the new boiler at the bottom.

At the top, a cap plate closes the chimney and the liner finishes in a terminal. Where an old chimney can’t be reused, a new stack can replace it.

  • Sir Thomas Boughey Academy, Stoke-on-Trent, flexible chimney liner Liner terminal and cap plate on top of the brick chimney at dusk.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, chimney liner terminal The terminal, with its mesh top, and the cap plate sealing the chimney.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, flexible chimney liner Looking up the chimney: the new liner fixed on support steel inside the bore.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, chimney liner base connection Base connection and plate where the flue enters the bottom of the chimney.
  • Currock Community Centre, Carlisle, flexible chimney liner Flexible liner and mesh terminal during the smoke test, before the chimney top is made good.
  • Matthew Arnold School, Oxford, chimney before lining Tall brick chimney before lining.
  • Wheeler Primary School, Hull, chimney before the works Victorian school chimney before the works.
  • Prestwick Airport, Prestwick, industrial chimney connection Existing industrial chimney with the new twin wall connection at its base.
  • Nortex Mill, Bolton, industrial chimney before replacement The old guyed steel chimney before it was replaced.

05 · 7 photos

Finishing

The small details show how a job was done. Wall plates and storm collars finish every opening through a wall or roof. strut channel gets end caps and threaded rod gets rod caps. The site is left tidy, and our engineers work in branded PPE.

Every project is inspected by a supervisor as part of our snagging and passing-off procedure.

  • Sir Thomas Boughey Academy, Stoke-on-Trent, chimney liner base plate Stainless cover plate sealed round the flue at the base of the chimney.
  • Sir Thomas Boughey Academy, Stoke-on-Trent, chimney liner terminal Storm collar on the terminal and a cap plate sealing the chimney top.
  • DVLA, Swansea, twin wall boiler flue Storm collar and weathering plate at the roof, with end caps on the support channel.
  • London Business School, London, generator exhaust terminal Polished terminal with a storm collar where it meets the roof.
  • Royal Orthopaedic Hospital, Watford, twin wall boiler flue A wall plate finishes the opening where the flue leaves the building.
  • London Business School, London, generator exhaust silencer Silencer hung from the soffit on threaded rods and channel.
  • DVLA, Swansea, flue support frame Channel steel frame standing on rubber feet on the roof.
  • Team photo to follow
    Team photo to follow Grün engineers in branded PPE, photographed from behind.

Send drawings. Get a price.

Drawings, photos or an outline of the job are enough to start. A price normally comes back within 24 hours.