Two stage air filter
AssigneeGreenheck Fan Corporation
InventorsKyle A. Brownell, Scott W. Mathews, Alan Lorenz Breitenfeldt, Emery W. Neitzel
Life of this patent
Estimating the term…
Abstract
A two stage air purification system is provided for the removal of airborne impurities from an airflow prior to the airflow entering a building's ductwork. In particular, a primary air filter is mounted within the hood of, for example, a cooking area and operable to receive grease-laden air and remove a portion of the impurities. The air is then sent to a secondary filter, also mounted within the hood, that removes additional impurities. The air is then sent through the building's ductwork and eventually out the building.
Claims35
An air purification system for receiving incoming air containing impurties and outputting purified air into ductwork of a building, the system comprising:
- a hood defining a hood outlet in communication with the ductwork;
- a primary filter member mounted to the hood for receiving the incoming air, removing at least a portion of the impurities therefrom, and outputting a primary airflow;
- and
- a secondary filter member mounted to the hood at a location downstream of the primary filter for receiving the primary output airflow therefrom, the secondary filter member having a secondary filter media operable to remove impurities from the primary airflow and output a secondary airflow to the hood outlet that is cleaner than the primary airflow.
2 The air purification system as recited in claim 1, further comprising a duct collar connected between the hood outlet and the ductwork to receive the secondary airflow from the secondary filter and forward the secondary airflow to the ductwork.
An air filter chamber comprising:
- a top wall;
- a pair of side walls extending inwardly from outer ends of the top wall at one end and having distal ends at an opposite end;
- and
- a front face defined by distal ends of the side walls configured to receive incoming impure air and direct the air into the top wall and side walls;
- wherein the top and side walls are defined by inner and outer porous members enclosing a filter media therein;
- and
- wherein the side walls extend substantially perpendicularly outwardly from the front face.
A method of removing impurities from an airflow in an air purification system disposed upstream of a building's ductwork, the air purification system being of the type having a primary filter and a secondary filter, the steps comprising:
- (A) drawing incoming air having air impurities into the primary filter;
- (B) removing air particles from the incoming airflow at the primary filter to produce a primary airflow;
- (C) outputting the primary airflow to the secondary filter;
- (D) removing air particles from the primary airflow at the secondary filter media to produce a secondary airflow;
- and
- (E) outputting the secondary airflow into the ductwork.
In an air purification system for removing airborne particles from an airflow prior to emitting the airflow into a buildings ductwork, the system including a hood defining a space for receiving incoming air having impurities and an outlet connected to the ductwork, and a primary filter mounted to the hood within the space, wherein the primary filter receives the incoming air and removes impurities prior to outputting once-filtered air towards the outlet, the improvement comprising:
- a secondary filter mounted within the hood and disposed within the space at a location downstream of the primary filter, the secondary filter operable to receive the once-filtered air from the primary filter and further remove airborne particles to output twice-filtered air towards the outlet.
A method of fabricating a two stage air purification system operable to receive incoming air having air impurities and outputting twice filtered air into the ductwork of a building, the steps comprising:
- providing a hood defining a hood outlet that is connectable to the ductwork, wherein the hood has a first filter mounted thereto to receive the incoming air and output once-filtered air toward the outlet;
- and
- mounting a second filter to the hood at a location downstream of the first filter to receive the once-filtered air and output the twice-filtered air toward the hood outlet.
Dependencies are inferred from the claim text.