Progressively denser synthetic media, it comes with PU frame with galvanised steel frame. The filters are tested as per ISO 16890-16 in European laboratories. Available ISO Coarse efficiencies and Energy rated as per EUROVENT (4/5).

Spectra pre Rod filter is a primary stage pre filter used commonly in stand alone system, AHU and other HVAC applications. The pleated synthetic filter media supported by Rods give higher media area and rigid structure enables lower pressure drop and less energy consumption. The construction of the filter is rigid, lightweight and easy to handle.

These are robust filters made of some layers of synthetic mesh that are non woven, sandwiched in between. The pleats are V shaped and rounded well to increase the dust arrestance of filters. Media is further enforced by metal expanded mesh to give extra rigidity to pleats so that peats would retain their shape at higher pressure drop.

Spectra Cell Compact filters offer substantial advantages over conventional filters, not the least of which are higher flow capacities, less space, reduced resistance to flow, and greatly enhanced dust holding capacities. 
It serves as an excellent final filter for AHU, air intake systems of combustion engines and as a final filter for HVAC systems.
An innovation for a better interior environment is the Mini Pleat Filter which guards against all types of particles, aerosols, bacteria, and coarse grit.