ya son..almost 30 years and. what older guys dont grow???..man cant even throw a bit of humor in the username info and get insulted. to bad you feel like a wannabe...maybe you are. typical to turn this to insults. id rather be from vansterdam than an inbred town of spuzzum like your username advertises....son
ya i know its a mesh casing as all filter are. its still made of steel over aluminum. so others are lighter. they also use cheeper grade carbon as i already said so they use more to keep up with the competition.. sure the origibal sources are mostly the same and i should have been more clear i reffer to the end result that we actualy use, didnt think that one was that hard to follow
that little toy can 33 is almost 10 pounds...almost half the total weight,,,not heavy,? its only 1 foot long. others are that for a total weight in comparable sizes made from lighter metal for the case.
why would i want to drill out the flanges and make them plastic and void the warrantee and still only get maybe 1 year use from the crap. ill just buy one thast lasts 3 so far and is cheeper and ligthter. your stats show nothing to show quality. weights and sizes is all....and cfm..how bout what microns...thats what counts for efficfiency. not the amount used now the weight. i see another fooled by adverwstising...thought you worked in this field and not a mention yet of micron info and how filers are tested...
the stuff for fish tanks are for large micron shit. we dont have visable pieces of odour in our air as there is visable large pieces in our fish tanks to clean. why doies worker compo require diff filter for diff sized micron gas or contaminates then if its all the same
Pore Structure While openings into the carbon structure may be of various shapes, the term "pore," implying a cylindrical opening, is widely used. A description of the minute distances between walls of these pores, normally expressed as a function of the total surface area or total pore volume presented by pores of various "diameters," is the pore structure curve. The following sketches show some sample pore structure curves and what approximate pore shapes are described by the curves. Please note that the average pore shape depicted is derived from a summation of pores of various sizes and shapes. Thus no pore within the activated carbon is likely to have precisely the average shape, but the granular activated carbon overall will often perform as if all its surface area were in pores of that shape.
The smallest diameter pores make up the micropore structure, and are the highest adsorption energy sites. Microporosity is helpful in adsorbing lower molecular weight, lower boiling point organic vapors, as well as in removing trace organics in water to non-detectable levels. Larger pore openings make up the macroporosity, which is useful in adsorbing very large molecules and aggregates of molecules, such as "color bodies" in raw sugar solutions. Another important function of the macropore structure is in assisting diffusion of fluids to adsorption sites in the interior of the carbon particle.
Given the above, pore structure. (1) would be effective in adsorbing high volatility solvents, for certain types of odor control, and in removing trace organics from water; the latter with the liability of marginal diffusion characteristics. Pore structures along the lines of. (2) offer a good balance of selectivity for molecules of various sizes, ability to reduce vaporous and liquid contamination to ultra low levels, and good diffusion characteristics. Structure (3) would allow excellent diffusion and can accommodate very large molecular sizes, but has little micro- pore structure and would have very poor retentivity for most organics.
Particle Size
The size of most granular activated carbons is given by the U.S. Sieve range that will include the majority of the particles in a distribution of sizes. Typically the range will cover 85-95% of the total product, with a few percent slightly larger and smaller sizes permitted by specification. A similar approach is occasionally used with Tyler Screen or other screen sizes. Pelletized carbon, although not truly granular, often is described by the sieve range method, or by diameter of the pellets.
Common vapor phase U.S. Sieve size ranges are 4x6, 4x8, 4x1 0, 6x16 and 12x30. Liquid phase granular activated carbons are usually somewhat smaller, with 8x30, 12x20, 12x40 and 20x50 being common. Detailed sieve descriptions are found in engineering handbooks, so only a few representative sizes are given here:
Since impurity removal requires the diffusion of adsorbate into the intra particle structure, the rate of adsorption will increase as the particle size decreases. As fluid flows through an adsorber, increased rate of adsorption will require less adsorbent bed depth and contact time for the region in which the adsorbate is being removed. This functional adsorption region is termed the adsorption wave front or ~ transfer zone. However, with any given fluid, decreasing particle size carries the liability of increasing flow resistance or pressure drop. In practice, particle sizes are selected to produce a reasonable balance between the competitive benefits of rapid rate of adsorption and effective removal, versus the liabilities of increased flow resistance and attendant higher pumping costs.
Quality Assurance Granular activated carbons quality and uniformity will fundamentally relate to characteristics involving: (1) adsorption capacity and (2) a physical description of the product. The activated carbon industry, often in cooperation with A.S.T.M. and other standards organizations, has developed a series of tests that measure these characteristics. As would be expected, such tests can be used both as production controls and, as published specifications, assurance for prospective buyers.
Not all granular activated carbons manufacturers and distributors publish adsorption specifications. Among those that adhere to specifications, the same precise group of tests may not be used. However, some correlation of values is usually possible as, for example, between the vapor phase carbon tetrachloride test used in the U.S. and the benzene and acetone tests more common in Europe and the Far East.
Among physical tests, the methods to determine moisture, apparent density and particle size or distribution are relatively standard among manufacturers. Hardness or abrasion values may require some interpretation or correlation, as above.
Terms such as "high quality; excellent adsorption characteristics; hard; dense; etc." are inadequate substitutes for specifications. They offer no guidance for comparison, no assurance of quality, and no confidence of uniformity.
. And the size of the pellet is essential.. if large gaps between the pockets, then air travels straight through unrestricted.. ie: ineffective.
