Specifications include, but are not limited to: 2.1All filters must be of the highest quality and comply with ASHRAE standards, latest applicable edition.2.2All products offered must meet applicable Federal Specifications.2.3All products offered must meet applicable American Society for Testing and Material Specifications.2.4CARDBOARD FRAME PLEATED FILTERS2.4.1 Filter media shall be 100% polyester material.2.4.2 Filter frame shall be a heavy duty one piece moisture resistant cardboard frame.2.4.3 Metal grids shall be bonded to both sides of the frame for added strength.2.4.4 Filters shall be U.L. 900 class 2 listed. 2.4.5 Manufacturer shall guarantee performance in accordance with data listed in their product bulletin.2.4.6 Filters shall have an efficiency rating of MERV 4 or greater per latest ASHRAE test standards.2.5CARDBOARD FRAME PLEATED FILTERS2.5.1 Filter media shall be 100% synthetic material.2.5.2 Filter frame shall be a moisture resistant die cut cardboard frame made with recyclable material.2.5.3 Frame shall have diagonal and horizontal support members for frame strength.2.5.4 Filters shall be U.L. 900 class 2 listed.2.5.5 Manufacturer shall guarantee performance in accordance with data listed in their product bulletin.2.5.6 Average atmospheric dust spot efficiency shall be 30-35% as determined by ASHRAE.2.5.7 Filters shall have an efficiency rating of MERV 8 or greater per latest ASHRAE test standards2.6 BAG/SOCK FILTERS2.6.1Filter media shall be 100% synthetic material.2.6.2Filter shall be composed of individual dust holding pockets assembled in a heavy duty galvanized steel header frame.2.6.3Filters shall be rated U.L. 900 class 2 listed.2.6.4Manufacturer shall guarantee performance in accordance with data listed in their product bulletin.2.6.5Filters shall have an efficiency rating of MERV 9 or greater per latest ASHRAE test standards