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4.6.3 Fresh Air Supply At the conclusion of the installation, the HVAC
contractor shall fully commission the entire
The supply air installation shall take the form of system including both duct systems and the
a suitable inlet louvre with bird/rodent guard gas safety interlock, and shall check by on-site
and sized on a min. free area of 50% and max. measurement that the airflows are within his
velocity of 2.5m per second. The system shall be appropriate designed parameters.
complete with a fresh-air filter to EU4 standard,
an axial flow fan, and a range of ductwork The ventilation of internal toilets shall be
terminating in ceiling mounted diffusers, with controlled by the light switch, being interlinked
integral dampers accessible through the diffuser with the extract fan timer. Internal offices shall
face, and finished in white. The fresh-air systems have a further fresh air supply, either with
shall be designed to replace approximately independent control or as part of the supply air
80% of the extract air volume. system.
Internal ceiling grilles in the Bake & Serve and Specific ventilation requirements for double
Customer area’s MUST be sprayed to RAL 7037 stacked bofi xlt-3255-ts gas fired ovens:
Matt to match the grey ceiling colour. Grilles in • The BOFI ovens use less gas than the Middleby
other areas should remain in white.
Marshall ovens and therefore have a lower
As part of the initial installation, the HVAC requirement for extract air volume.
contractor shall include a nominal 12 months • The manufacturers required extract figure is:
supply of replacement fresh air filters. 1800cfm for the double oven, of which we
will replace 80% via the fresh air supply fan.
The design of the system must take into • The standard canopy size is 2500mm x
account the requirement for store staff to be 2000mm x 550mm in all cases.
able to change the fresh air filters on a regular • The gas safety interlock system will be required
basis without need for specialist equipment or under UK legislation, as at present. Please
contractors. Therefore the fresh air filter must note that because the gas requirement is
be located in an accessible position, and lower, in theory the pipe size for a double
orientated so that the store staff are able to oven can be reduced to 32mm, however
access the filters easily, including positioning to allow for future upgrades, it has been
so that the access panel is not obstructed by decided to remain with the 42mm standard
walls, ceilings, pipework, etc. and that there is pipe from meter to ovens.
sufficient space in front of it for the replacement • All other general ventilation considerations
panel. Liaison with the main contractor to noted above for the Middleby Marshall
achieve this will be required. ovens will apply equally to the BOFI oven.
Both exhaust ductwork outlet and fresh-air inlet
points shall be located to minimise short circuiting
so that exhaust air cannot be drawn back into
the building through openable windows etc.
4.6.3 Fresh Air Supply 3 February 2016
