1.0 General

1.1- Air filters shall be medium efficiency ASHRAE pleated panels consisting of cotton and synthetic media, media support grid, and enclosing frame.

1.2- Sizes shall be noted on drawings or other supporting materials

2.0 Construction

2.1- Filter media shall be a cotton and synthetic blend, lofted to a uniform depth of 0.18", and formed into a uniform radial pleat.

2.2- A welded wire grid, spot-welded on one-inch centers, treated for corrosion resistance, shall be bonded to the downstream side of the media to maintain the radial pleat and prevent media oscillation.

2.3- An enclosing frame, of no less than 28-point high wet-strength beverage board shall provide a rigid and durable enclosure. The frame shall be bonded to the media to prevent air bypass, and include integral diagonal support members on the air entering and air existing side to maintain uniform pleat spacing in varying airflows.

3.0 Performance

3.1- The filter shall have a Minimum Efficiently reporting value of MERV 7 when evaluated under the guidelines of ASHRAE Standard 52.2-1999. It shall have an acreage dust spot efficiency of 25-30% when evaluated under ASHRAE Standard 52.1-1992. Minimum dust holding capacity when evaluated under this standard shall be no less than 170 grams.

3.2- Initial resistance to airflow shall not exceed (0.25", 0.28", 0.27") w.g. at an airflow of (350,500,500) fpm.

3.3- The filter shall be classified by Underwriters Laboratories as UL Class 2

Supporting data- Provide product test reports for each listed efficiency including all details as prescribed in ASHRAE Standards 52.1 and 52.2.