Rigid

A rigid box filter frame boasts a rigid construction made using 26 gauge galvanized steel. A heavy gauge, galvanized steel header is optional. The media is a high density synthetic fiber or a microfine glass fiber. The filter media pack is constructed by pleating a continuous sheet of media into uniform spaced pleats, which are separated by flame retardant, injection molded plastic media separators. A heavy-duty expanded metal reinforcement is laminated to the air exit side of the media by a thermo-setting adhesive to maintain continuity of the radial pleats. The expanded metal is also galvanized to resist rust and corrosion. Metal vertical brackets is utilized to stabilize the media pack and prevent air bypass. The air entry and air exit side is fitted with two 26 gauge support struts and the pleated media ends are sealed to the top and bottom of the metal frame to prevent air bypass. These filters have been rated to withstand temperatures up to 180 degrees Fahrenheit.