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Automotive Filters

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Industrial Filters

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Pre Filters

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Fine Filters

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Hepa Filters

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M. N. RAMA RAO & COMPANY is an ISO 9001-2000 certified company with expertise in the Design, Manufacture, Testing, and Commissioning of a wide variety of filters for Automotive, Industrial, and Pollution Control applications. By pioneering the introduction of the Flexible Porous Cellular Plastic (FPCP) media in India, MNR has evolved as the largest supplier of air filters for two wheelers in the country, with over 85% market share. In fact, every large two wheeler manufacturer in the country is a customer of ours. MNR is a family owned (and run) organization with low overheads where our customers experience the benefits of personalized service, short turnaround times, total focus on technical excellence and quality. For industrial applications, MNR supplies filters and filtration solutions to the rapidly expanding pharmaceutical sector, hospitals, outsourced manufacturing, paint shops, and a variety of other industries. In short, since 1973 MNR has been designing and manufacturing filters that provide creative and technically competent solutions for almost all automotive and industrial filtering requirements. MNR is proudly associated with EMW Filtertechnik Gmbh of Germany, a world leader in Air, Water and Molten Metal filtration, for over 25 years. The technical collaboration helps in offering customers high quality and high performance products at a competitive price. Our warehousing facilities enable us to develop and maintain an efficient supply network in the country and across the world. For MNR, Customers First is not just a slogan, but a way of life. We have a 25,000 sq.ft. factory in the heart of Bangalore, India, where our filters are designed and manufactured with pride.+ Read More

Nature of Business

Manufacturer

Total Number of Employees

51 to 100 People

Year of Establishment

1973

Annual Turnover

Rs. 10 - 25 Crore

Automotive Filters
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Automotive Filters

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Back in the early 80s, MNR realized that FPCP media (Open Cell Reticulated Polyurethane Foam) was far better suited for air filtration than the paper filters that were prevalent at that time. The development of this special foam represented a major advancement in high technology air filtration. Foam air filters combine great airflow capacity, huge dust holding capacity and very high filtration efficiency even for particles in the range of 1 micron. FPCP media is a honeycomb of tiny interlocking cells of relatively uniform size which creates a tortuous path for the dust particles to take. Each passageway, 16-25mm long, acts like hundreds of very small filters all connected to one another. This is the reason why FPCP is referred to as depth loaded filters. Dust passes through the depth of the FPCP media getting trapped on the struts of the FPCP media. Oil is used to coat the struts of the FPCP media to act as a tackyfier holding the dust firmly once it has hit a strut.

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Industrial Filters
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Industrial Filters

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One cubic meter of air consists of more than 9 million particles in the range of 0-0.5 microns occupying 1 % of the volume but representing 98.5 % by Particle Count. Just 500 particles in the range 10-30 microns occupy 30 % of the volume but represents only 0.005 % by Particle Count. No one filter media can effectively handle a conglomeration of such particles: hence the importance of PROGRESSIVE FILTRATION

Progressive Filtration is a method where considerable life extension of a filter can be obtained by creating a PROGRESSIVE STRUCTURE of the filter media with differing pores arranged behind one another so as to produce a uniform reduction in the porosity towards the clean air side.

We, at MNR, have successfully developed technically competent and competitively priced solutions for all customer requirements. This has made MNR synonymous with filtration solutions amongst many industry majors across the country.

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Pre Filters
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Pre Filters

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Pre Filters manufactured by MNR, are tailor-made for handling required air volumes and offer our customers competitive pricing and performance. They come in two versions: the Cassette Type and the Pocket Filter Type. Both filters are made from high quality imported filter media and are subject to stringent quality checks not only for the raw material use but also for the manufactured filters.

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Fine Filters
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Fine Filters

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The Fine Filters are made from superior quality synthetic, glass fiber and FPCP media. They are used for secondary or fine filtration for HVAC, general filtration, and for the needed air flow volumes. The benefits of these filters are listed below.

Advantages of Synthetic Media based Fine Filters

  • Graded Density fibers ensure progressively better filtration
  • Thermally bonded without resins ensure long life with no filtration problems
  • Low initial pressure drop ensures huge dust holding capacity
  • Cleanable by reverse blowing of air
  • Efficient
  • Economical
  • Solid construction with superior materials ensure longer life
  • Optional protection grid for added safety
  • Optional pleat separators to maintain optimum pressure drop over filter life
  • Optional washable & re-usable filters with our proprietary FPCP (+) technology to meet all F- group filter grades

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Hepa Filters
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Hepa Filters

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The Deep and Mini-pleat HEPA Filters are manufactured using high quality microfine glass fiber papers. The Mini-pleat filters are pleated in fully automatic machines. The pleats are spaced apart with precision using fused plastic threads which also provide extra rigidity and stability to the filters.

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Ceramic Foam Filters
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Ceramic Foam Filters

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The Ceramic Foam Filters have the same inherent shape as that of the FPCP media. They are highly efficient, have an open pore and a reticulated structure with a very high volume of porosity- in excess of 90% - and very high surface area to trap inclusions. The Ceramic Foam Filters are manufactured by impregnating the base FPCP media with ceramic slurry and baking it at very high temperatures. During this process the base FPCP media melts away and the ceramic skeleton structure remains. In these filters the molten metal takes a tortuous path, leading to the removal of very small inclusions by attraction and adsorption to the internal ceramic pore surfaces.

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Noise Absorber Foams
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Noise Absorber Foams

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  • Hot roll lamination of skins
  • Application of adhesives

Noise
Noise can be explained as any unwanted or unpleasant sound regardless of its intensity or duration. Noise originates from a sound source and is transmitted to the human ear. Sound can be differentiated into two: one that travels through air and the other, through solid objects. The latter can be defined as structural-borne sound.

To control noise effectively, it's important to distinguish between the two types of sound and the medium in which it propagates. Sound waves are a form of elastic waves that occur in any medium that has mass and elasticity. When mass (inertia) enables disturbed particles to transfer energy to the adjacent particle, elasticity enables the disturbed particle to get back to its original position, like a spring. This propagation of momentum from one particle to another explains the manner in which sound waves travel.

All materials with mass and elasticity allow sound waves to propagate within it. This results in the vibration of the object. When the object vibrates, the air and particles surrounding it vibrates. This starts a chain reaction which, in turn, enables sound waves to propagate. These waves produce variations in the ambient pressure and it is this pressure variation that reaches the listener's ear as sound or noise. The ear drum is sensitive to the pressure variations produced by the vibrating particles. Structural-borne sound functions similarly as airborne sound, except the particles that vibrate in the chain of vibrations happen in the medium that propagates the sound. As the mass and elasticity of each medium varies, the properties and the speed of the sound waves will also vary.

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