Spectra Drop Shield Reverse pocket (SDSRP) filters are unique premium hydrophobic pre-filters in reverse air flow direction where space is a constraint. The SRP pocket filters serve as efficient pre or final filters in air intake systems of Gas turbines in any environmental condition (including offshore, marine) and in any climate (including tropical). They efficiently remove air borne particulate matter but also snow, mist and fog acting as a filter and a coalescer in one. SDSRP filters are specially designed for the elimination of free water and air borne salt crystals. Where subsequent final filters are placed, they protect them not only from coarse dust but also from running in wet conditions. The SDSRP filters do significantly prolong the filter lifetime of the final filter and increase their operational safety.

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 Eco Pleat is specially designed to protect coarser filters with high dust arrestance. Designed with moisture resistance cardboard frame, engineered with expanded metal backed synthetic media, ECO pleat is fully incinerable.

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.