Provided Pre Filter is used for preventing deposition of dirt and dust on cooling coils located inside ventilation system. Robust in construction, this moisture proof filtering system can be accessed in different sizes. Its maximum filtration depth is 4 inch. This Pre Filter uses non woven cotton made synthetic blend media. Its operating temperature is up to 93 degree C. Efficiency level of this product ranges between 35% to 95%. Approximate weight of this filter is 1.5 kg and maximum final resistance is 250 Pa.