Grün Engineering
Two stainless flue runs on wall brackets ending in roof fans on a brick hotel elevation
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Flagship project Fireplace and boiler flues GE4103, GE4133, GE4146

60 Hyde Park Gate

Three fan assisted flues for the gas fires in a London hotel, plus a survey and replacement design for its boiler flue.

Site
60 Hyde Park Gate
Town
London, London
Sector
Hotel
Status
Fire flues complete

Key facts

gas fires, one flue each
3
twin wall, 250 OD, 25 mm insulation
Ø200
fans: two roof fans, one in-line
3
2026, routes in first, fires connected last
16 Jun to 28 Sep

The challenge

The hotel refurbishment had three gas fires, in the Salon, the Rose Bar and the private dining room, each needing its own flue route out of the building.

The routes had to fit round the refurbishment, through shallow ceiling voids and up the outside of the building.

The fires were sited after the routes went in, so the final connections had to wait.

What we did

We surveyed, sized each flue at Ø200 with a flue volume calculation, and drew the three routes.

Each flue is twin wall insulated and fan assisted. Two finish in roof fans on wall brackets, and one runs through an in-line fan to a grille on the outside wall.

Risers sit on wall brackets with base plates, and the horizontals hang from strut channel and threaded rod trapezes.

Alongside, we surveyed the existing boiler flue and designed its replacement for three boilers.

The result

All three fires were connected on 28 September 2026, with 250 to 200 mm reducers on the two fires with larger outlets.

The certificate of conformity and the O&M handover pack went into the project folder the same day.

The boiler flue replacement design was issued for approval in June 2026.

On site.

8 photographs. Tap a photo to see it larger.

60 Hyde Park Gate, London. Two flues finishing in their roof fans.
60 Hyde Park Gate, London. Roof fan carried on its wall bracket.
60 Hyde Park Gate, London. The paired risers on wall brackets during the works.
60 Hyde Park Gate, London. Final connection at one of the fires.
60 Hyde Park Gate, London. A 250 to 200 mm reducer at a fire with a larger outlet.
60 Hyde Park Gate, London. The third fire, connected into its ceiling route.
Survey photo. 60 Hyde Park Gate, London. Existing boiler flue terminal at survey.
Survey photo. 60 Hyde Park Gate, London. Existing boiler flue joint and support at survey.

The drawing.

Issued for approval.

Elevation drawing of three fireplace flue risers and the lower connection arrangement
Fire flue routes, drawing 0000-002, 24 March 2026. Issued for approval.

Finishing details

The details we leave behind.

  • Roof fan on a flue

    Fans with safety switches

    Each fan has a pressure switch for safe operation.

  • Reducer above a fire

    Reducers at the fires

    250 to 200 mm reducers on the two fires with larger outlets. The third connects direct.

  • Flue risers on wall brackets

    Capped fixings

    Strut channel end caps and rod end caps fitted on every support.

Handover

What the client got.

The documents on record for this job. Handover documents normally go into the customer's project folder before the engineers get home.

  • Technical submittalFlue volume calculation for each run, 23 March 2026
  • CAD route drawings0000-002, 0000-003 and 0000-004
  • Progress reportFinal visit, 28 September 2026
  • Certificate of conformity28 September 2026
  • O&M and handover packGE4103-OM-001, with photo register and maintenance schedule
  • Boiler flue survey reportExisting boiler flue

Related services

Boiler flues Design and calculations Testing and surveys Service and maintenance

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