NSF ANSI 37:2017 pdf free download – Air curtains for entranceways in food and food service establishments
1.2 Scope
Equipment covered by this Standard includes, but is not limited to, air curtains for entranceways in food and food service establishments (e.g., service and customer entries, service windows, cooler and cold storage entries). Housing, air moving equipment, air directional regulating devices, and other appurtenances to the air curtain are included. This Standard does not establish equipment installation requirements. While the requirements of this Standard are intended to ensure that equipment may be installed in a sanitary manner, proper installation of equipment shall be governed by the applicable codes. Equipment components and materials covered under other NSF or NSF/ANSI Standards or Criteria shall also comply with the requirements therein. This Standard is not intended to restrict new unit design, provided that such design meets the minimum specifications described herein.
1.3 Alternative materials, design, and construction
While specific materials, design, and construction may be stipulated in this Standard, equipment that incorporates alternate materials, design, or construction may be acceptable when such equipment meets the applicable requirements herein.
1.4 Measurement
Decimal and SI conversions provided parenthetically shall be considered equivalent. Metric conversions and significant figure rounding have been made according to IEEE/ASTM SI 10. 2 Normative references The fllwing documents contain provisions that, through reference, constitute provisions of this NSF/ANSI Standard. At the time this Standard was balloted, the editions listed below were valid. All documents are subject to revision, and parties are encouraged to investigate the possibility of applying the recent editions of the documents indicated below. The most recent published edition of the document shall be used for undated references.
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 manufacturer’s 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 (1 50 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 manufacturer’s 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.