NSF ANSI 37 pdf free download

NSF ANSI 37 pdf free download.Air curtains for entranceways in food and food service establishments.
3 Definitions 3.1 air curtain: A device that delivers a vertical stream of air across an opening for the purpose of keeping tempered air from moving out of the building and insects from moving into the building. 3.2 air curtain protected openings: 3.2.1 customer entry: Exterior passage for entrance into an establishment primarily intended for customers 3.2.2 service entry: an exterior passage for entrance into an establishment primarily intended for employees and the delivery of supplies. 3.2.3 service window: an exterior opening in the wall of an establishment primarily intended to pass finished goods to customers. 3.3 airstream: The directed flow of air generated by an air curtain assembly. 3.4 airstream discharge nozzle: The slot from which the airstream exits the air curtain assembly. 3.5 maximum effective airstream height: Manufacturer specified value indicating the maximum height of the airstream in compliance with the applicable performance test protocol in section 6. This value is measured from the bottom of the airstream discharge nozzle. 3.6 maximum effective airstream width: Manufacturer specified value indicating the maximum width of the airstream in compliance with the applicable performance test protocol in section 6. 3.7 Other definitions: Other terms used in this Standard that have special technical meaning are defined in NSF/ANSI 170. 4 Materials The requirements contained in this section are intended to ensure that the materials used in construction of equipment resist wear; penetration by vermin: and resist the effects of food, heat, refrigerants, cleaning compounds, sanitizers, and other substances that may contact the materials in the intended use environment. 4.1 Corrosion resistance Exposed surfaces shall be corrosion resistant. Surfaces may be rendered corrosion resistant by the application of a coating or coatings. Coatings shall conform to the requirements in 4.3.
4.2 Smoothness and cleanability
Exposed surfaces shall be smooth and easily cleanable.
4.3 Coatings
4.3.1 Coatings containing lead as an intentional ingredient shall not be used. Coatings with an unintentional lead content (lead impurity) greater than 0.06% shall not be used.
4.3.2 Coatings shall resist cracking and chipping under use conditions.
4.4 Gaskets
Gaskets shall be made of resilient rubber, rubber-like materials, plastics. or a combination thereof.
5 Design and construction
This section contains design and construction requirements for equipment covered within the scope of this
Standard.
5.1 General design and construction requirements
5.1.1 Sanitary design
5.1.1.1 Equipment shall be manufactured to prevent the harborage of vermin and the accumulation of dirt. debris, and moisture, and to permit the inspection, maintenance, servicing, and cleaning of the equipment and its components.
5.1.1.2 Exterior surfaces shall be easily cleanable. Interior surfaces of units subject to accumulation of soil shall be accessible for cleaning.
5.1.2 Joints and seams
Permanent joints and seams shall be closed. Joints formed by overlapping sheets of metal shall not create upwardly facing horizontal ledges (see figure 5).
6.1.2.2 On the floor, centered under the air curtain airstream discharge nozzle. a grid pattern shall be laid out that is 6.0 in (150 mm) deep. The grid shall begin 1.0 in (25 mm) from the edges of the manufacturers specified maximum effective airstream width for a service window opening. Four rows of points spaced 2.0 in (51 mm) apart shall be marked. Columns of points shall be evenly spaced from side to side, with spacing not exceeding 6.0 in (150 mm). A plumb bob shall be used to ensure that the grid pattern is centered from front to rear and side to side under the airstream discharge nozzle. Measurements on this grid shall be made in the plane 1/3 the distance of the vertical opening above the service window counter top. The service window lower test grid is shown in figures 1 and 2.
6.1.2.3 A second grid shall be used consisting of a single row of points, beginning 1 .0 in (25 mm) from the edges of the manufacturers maximum specified service window width. Points shall be spaced an equal distance apart as close to but no greater than 6.0 in (150 mm). This grid shall be centered from front to rear and side to side directly under the airstream discharge nozzle. Measurements along this grid shall be made in the plane 10 in (250 mm) below the airstream discharge nozzle. The service window upper test grid is shown in figure 3.NSF ANSI 37 pdf download.