A composition for preparing a rigidified fabric made of heat resistant fibers or threads of heat resistant fibers, preferably of woven threads made of heat resistant fibers, said composition comprising a mixture of a product A and a product B, the product A being obtained by polymerization of carbohydrate units, natural or synthetic, preferably a saccharide, and more preferably a sugar such as glucose, fructose, galactose, sucrose, maltose, lactose, etc.; and the product B consisting of at least one additive such as a binding agent. A method for preparing said composition, a method for preparing a rigidified fabric of heat resistant fibers, the method for the manufacture of filtering devices, filtering devices so obtained, their use for the filtering of metal, and installation and process involving said filtering devices.

An additive carrier for a spin-on filter is provided. The additive carrier is positioned at an upstream side of the filter and includes a basket defining an annular body. The annular body includes a concentric opening extending therethrough, a circumferentially extending recess configured to receive and store an additive material and a plurality of flanges extending radially within the recess, the flanges spaced apart in a circumferential direction of the recess to form a plurality of sub-recesses.

An additive carrier for a spin-on filter is provided. The additive carrier is positioned at an upstream side of the filter and includes a basket defining an annular body. The annular body includes a concentric opening extending therethrough, a circumferentially extending recess configured to receive and store an additive material and a plurality of flanges extending radially within the recess, the flanges spaced apart in a circumferential direction of the recess to form a plurality of sub-recesses.

The present application relates generally to filter media useful for manufacturing air filters for residential and commercial office's Heating, Ventilation, and Air Conditioning (HVAC), particularly to filters and filter media comprising soybean-based materials. The present invention provides an inexpensive, effective, environmentally friendly, and sustainable media for manufacturing HVAC air filters for residential and commercial buildings.

Electret melt-blown webs made from a polypropylene composition (PC) comprising a propylene homopolymer (HPP) having: a. a melt flow rate MFR.sub.2 in the range from 400 to 5000 g/10 min, b. a melting temperature Tm, in the range from 140 to 160? C., and c. a content of 2, 1 erythro regiodefects in the range from 0.01 to 1.5 mol %.

A filter device is provided with an annular filter element. A central tube is inserted into the annular filter element so as to delimit an inwardly positioned cavity of the annular filter element. A functional part is inserted into the annular filter element and extends parallel to a longitudinal axis of the annular filter element, wherein the functional part is arranged in radial direction of the annular filter element outward of the central tube. The functional part has a radial inwardly positioned wall facing the central tube. The central tube has a facing wall that is facing the radial inwardly positioned wall of the functional part. The radial inwardly positioned wall of the functional part is positioned parallel to or concentric to the facing wall of the central tube.

An additive carrier for a spin-on filter is provided. The additive carrier is positioned at an upstream side of the filter and includes a basket defining an annular body. The annular body includes a concentric opening extending therethrough, a circumferentially extending recess configured to receive and store an additive material and a plurality of flanges extending radially within the recess, the flanges spaced apart in a circumferential direction of the recess to form a plurality of sub-recesses.

A scent-releasing air filter assembly for freshening air includes a shell that defines an interior space. The shell is configured to couple in-line to an air circulation unit. A fibrous material is positioned in and substantially occupies the interior space. A reservoir, which is coupled to the shell and configured to contain a fluid, is in fluid communication with the interior space. The fibrous material is permeated by the fluid that flows from the reservoir. Each of a plurality of holes is positioned in a respective opposing side of the shell. The holes are configured to allow entry of air into the interior space from a first face of the shell and to permit exit of the air from a second face of the shell. The fibrous material is configured to remove solid particulates from the air concurrent with the release of a fragrance from the fluid to the air.

A device for providing purified water from a silt-laden source water having an upper canister, a lower canister, and a filter mounted in the upper canister; wherein the upper canister and the lower canister are fluidly connected via the filter; wherein pre-filtered water is collected in the upper canister and purified water is collected in the lower canister; wherein a pre-filter is fluidly connected between the source water and the upper canister; wherein the pre-filter has a pre-filter canister having an inlet for source water and an outlet for pre-filtered water; wherein the pre-filter canister contains a fine depth filter and a felt filter.

Disclosed herein are porous graphene filters, each consisting of a carbon monoatomic layer having small holes formed therein during the graphene formation, a plurality of the porous graphene filters being used to selectively filter a specific material from a mixture of at least two different materials, a method for manufacturing the same, and a filtering apparatus using the same. The method comprises: separately forming a first graphene filter having a first hole of a first size and a second graphene filter having a second hole of a second size, during deposition of carbon atoms generated from a carbon source for formation of graphene, by substituting the carbon atoms, in part, with a substitution atom generated from a substitution source, the second size being larger than the first size; and arranging the first graphene filter and the second graphene filter in a filter body equipped with an inlet and an outlet.