4  SPECIFIC PRINCIPLES TO COVER EXCEPTIONS AND ADDITIONS TO THE DESIGN, CONSTRUCTION AND CLEANING OF ALL BAKERY EQUIPMENT, AS DEFINED IN SECTION 3.

4.14  DESIGN REQUIREMENTS FOR OVENS

4.14.1 Specific Design Requirements

4.14.1.1 All non-metallic materials, such as soapstone, transite, carborundum and ceramic tile, used in construction of baking hearths should be free of protrusions and cavities. Oven hearths should be cleanable and free from inaccessible crevices.

4.14.1.2 Wire mesh and metal band conveyor hearths shall be provided with means of cleaning the baking surface.

4.14.1.3 Guards shall be provided to protect the product from contact with lubricated chains.

4.14.1.4 When a protective coating of the ceiling or crown of an oven is used it shall be a high temperature type.

4.14.1.5 Traveler chains shall be smooth to prevent the accumulation of excess graphite or other lubricants.

4.14.1.6 Ovens shall be so constructed that traveler chain lubricant can be applied at a place other than at a sprocket.

4.14.1.7 Access doors shall be placed on the oven housing so the entire baking surface is readily accessible and all other areas are accessible. Band oven clean-out door sill shall be even or below the baking chamber floor.

4.14.1.8 All surfaces where crumbs or topping may accumulate shall be readily accessible and cleanable.

4.14.1.9 Observation windows shall be readily accessible or removable, and shall be constructed of shatter-and heat-resistant materials.

4.14.1.10 The area beneath and behind oven load and unload conveyors shall be readily accessible. A 6 inch (150mm) minimum clearance shall be maintained between the conveyor return run and floor on fixed conveyors.

4.14.1.11 Pipe insulation shall be cleanable and impervious to moisture.

4.14.1.12 All external surfaces of insulation shall be hard finished, smooth and easily cleanable.

4.14.1.13 The top surface of an oven shall be hard finished and easily cleanable.

4.14.1.14 Exterior finish other than insulating panels shall be readily removable and the bottom edges of such sheets should terminate not less than 2 inches (50mm) above the floor.

4.14.1.15 Recirculating fans or agitators shall be accessible.

4.14.1.16 The oven heating system shall be designed and constructed to prevent the entry of soot or fly ash into the baking space.