Deltavent

Deltavent Pressure Resistant System

Deltavent is a twinwall stainless steel prefabricated exhaust/duct system available as Deltavent 25 with a 25mm insulating gap or Deltavent 50 with a 50mm high mineral wool insulation, 75mm and 100mm annulus available on request.

The Deltavent is designed for use where a four hour fire rating is specified. A positive pressure high temperature exhaust/duct system or water tight flue system is specified.

It can be used on diesel generator exhausts, condensing boilers, CHP Systems Oil and gas fired boilers that operate with positive exhaust systems, fan assisted flue systems, kitchen extract and smoke extract systems.

Deltavent 25 system and a Deltavent 50 system have been successfully tested for stability and integrity during a four hour test carried out at the Loss Prevention Laboratories, Borehamwood.

A copy of the full test report is available from firetest@a1flues.co.uk.

Deltavent contains fire at leading Essex entertainment venue

When Nottinghamshire based A1 Bridge Flues Systems had their Deltavent flue system fire approved, they did not foresee that one of their first installations would help save one of Essex’s largest entertainment venues.

The Deltavent system is fire rated at four hours and designed to accommodate high pressures as found in generators and smoke extract systems.

Cliffs Pavilion is one of the south coast’s leading entertainment venues. The building looks towards the sea and hosts a broad range of pantomimes, plays, shows, dances, and conferences.

Redeveloped at a cost of £5m, the scheme included the provision of new boilers and flues with two pressure jet gas fired boilers each rated at 750kW and located in the ground floor plantroom. Flue gases are passed through boiler outlets, dampers, induction fans and two 450mm diameter flues connected to a single horizontal Deltavent flue which extends for three metres, exiting the building as a 21m vertical brick encased steel flue.

Shortly after the redevelopment an undetected fire broke out in one of the boilers, eventually spreading into the flue system. The fire was totally contained within the flue for a period of 48 hours until the alarm was raised and the fire brigade brought the fine under control.

Heat had been so intense that the damper in the boilers where the fire had started was beyond repair with the steel plates buckled by the heat. At the time the fire brigade commented that if the flue system had been unable to maintain such a high level of containment, the building itself would have been at greater risk. Once the clean up operation was completed a new boiler, damper, induction fan - and Deltavent flue system were installed.