Bakery halls normally have ovens installed in it .Special attention needs to be given for ventilation in the baking hall
. Roof are designed in such a way that it helps in natural ventilation. The temperatures in these halls touches 50- 55 deg c in summer in some places which makes condition difficult for bakers and operators to work in these condition .
Normally bigger plants with more than two or three units placed in the same hall s have more problem than a single unit . Ensure that the roof height are something between 30 - 35 ft from the ground level and have ample space for heat to disperse .
Following methods are used to for ventilation
Forced Ventilation
Axial fans are installed at the roof with capacities matching the hall dimensions . fans are installed in the walls as well roof supported on the trusses and wall . structure needs to be erected for installation , repair and dismantling of these fans .This methods consume more energy as axial fans are drive by motors .
Natural ventilation
Roof are designed such a way that it helps natural ventilation . series of wire mesh is fixed in the entire length which allows hot air to escape through it and preventing dust other foreign bodies to go inside the hall . fans can be installed which can use the hot airs to run itself hence creating draft for air to escape to the atmosphere through roof .
Normal air change over for any bakery hall could be between 25 -20 air change/ hour .These could be calculated with taking area to be venntilated and capacity of the blower.