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

4.2  DESIGN REQUIREMENTS FOR DOUGH TROUGHS

4.2.1 Definitions

4.2.1.1 The product zone of a dough trough shall include all inside surfaces, the exterior of the rim, and all other surfaces with which the product may come in contact.

4.2.2 Specific Design Requirements

4.2.2.1 All surfaces shall be of corrosion-resistant material or shall be of protectively coated material.

4.2.2.2 Trough rims shall be so constructed that the underside and corners shall be readily accessible for cleaning or, if closed, shall be sealed by welding or by other suitable means. The trough rim corners shall be structurally reinforced to reduce damage.

4.2.2.3 Division boards are part of the product zone.

4.2.2.4 The interiors of top extensions and trough covers are part of the product zone,

4.2.2.5 If hinges are used in the product zone, they shall be designed so that all parts of the hinge are accessible for cleaning.

4.2.2.6 Bearings shall be outside the product zone and shall be sealed or self-lubricated; and the design and construction shall be such that lubricant cannot leak, drip or be forced into the product zone.

4.2.2.7 Rack-and-pinion-type ends shall be designed so that the gate is removable.

4.2.2.8 Chute-type ends shall be designed so that the hinge, over-lapping guides and other parts that come in contact with the dough shall be accessible for cleaning.

4.2.2.9 Gate-type ends shall be designed so that all parts in the product zone shall be readily accessible for cleaning.

4.2.2.10 Slide-end troughs shall have removable ends.

4.2.2.11 Guide grooves in slide-end troughs shall be rounded to provide for drainage and shall be readily accessible.

4.2.2.12 All non-product zone surfaces shall be smooth and may be protectively coated except on metal-to-metal moving contact areas.

4.2.2.13 Caster shoes shall be totally enclosed. When permanently attached, such attachment shall be a continuous weld.

4.2.2.14 Hoisting hooks and other outside attachments shall be attached to the trough so that no cracks or crevices are formed.

4.2.2.15 Hollow shafts or pipes used in locking devices shall be sealed.

4.2.2.16 The exteriors of top extensions and trough covers are part of the non-product zone.