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