Gilberts rises to the (lofty) challenge for city centre challenge

  • 19 Sep 2019

The ventilation strategy designed by Gilberts Blackpool has already proved its capability to deliver on massively-varying requirements for the ‘ground-breaking’ 143 metre high Manhattan Loft Gardens in the heart of London.

Within days of the 42-storey mixed use tower opening, temperatures outside reached 30°C in the shade, yet inside, guests felt cool and fresh, whether in the restaurant, guest rooms, bar or the lofty mezzanine space.

Chris Howard, Gilberts’ Regional Manager, commented: “The engineers (Skidmore Owings & Merrill) describe the construction of the tower as a balancing act, with sections “cut out” and cantilever design keeping the whole concrete & steel structure supported.

“It’s a good description of the ventilation strategy too: we had to design a combination of grilles and diffusers that met the high aesthetics demands of the project, yet could deliver the performance required, and be fitted in sometimes very challenging locations.”

Gilberts was commissioned by Foreman Roberts building services consultant, on behalf of ISG, to develop a strategy for delivery of an energy-efficient air movement programme.

Thus, Gilberts provided the grilles and diffusers for the whole six-storey five star hotel, The Stratford, at the base of the tower, and the restaurant on the seventh floor. The building has achieved a BREEAM ‘outstanding’ rating.

In developing the solution, Gilberts had to address, among other constraints:

– a means of ensuring an even spread of cool air without ‘dumping’ in the mezzanine

– a thin shadow gap with a lip as the only potential site for grilles in the bar and open areas

– bulkheads with no opportunity for face fixing in the guest rooms

– air for the restaurant only being achievable from the side via the ceiling

The company’s in-house R&D capability and manufacturing expertise enabled bespoke variations to be quickly designed, developed, and tested to prove delivery and maintenance of the required indoor air temperatures and quality.

In the high level mezzanine, Gilberts Series GSJ thermally adjustable circular swirl diffusers were used. The stand-alone solution adjusts air flow across the ceiling depending on the internal temperature, giving an even spread of fresh, cool air within the space without cold spots or cold air ‘dumping’. 

In the restaurant which occupies the entire seventh floor, the only area available to serve fresh air into the space was via the ceiling on one side of the building, yet that fresh air had to permeate the whole area, with no draughts.

Gilberts’ Series GSL linear slot diffuser in eight-slot variant delivered the air volumes required and met the aesthetic demands.

In the guest rooms, air supply and extract was through the bulkhead, the design of which gave no potential for face fixing.

Gilberts developed a bespoke version of its Series L with a removable core and a new attachment method so the face of the grille would remain securely in place.

In the bar and open areas, Gilberts’ Series L linear bar grille was engineered with a narrow border and 15 degree angle blade to fit discreetly into the shadow gap, and provide airflow around the lip in front of the grille.

Peter Vance, of Foreman Roberts, commented: “We were delighted with Gilberts’ performance throughout. They spend countless hours selecting the appropriate grilles, that delivered the high performance and aesthetics needed, and developed bespoke solutions where necessary. Even when external temperatures exceeded the norm, the grilles did their job.”


Gilberts of Blackpool,
Gilair Works,
Clifton Road,
FY4 40T

Phone: 01253 766911
Fax: 01253 767941

Visit Gilberts of Blackpool's website

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