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US 5,704,953 AGranted
Forced air system air filter
AssigneeAir Kontrol, Inc.
InventorMichael J. Stemmer
Life of this patent
Estimating the term…
Abstract
An HVAC filter having a pleated paper filter and a plastic pre-filter, the filter and pre-filter are mounted in a parallel relation in the frame. The plastic pre-filter includes a plastic mesh having a plurality of openings, and an irregular surface on the inlet side to prevent matting of filtered material.
Claims19
An air filter comprising:
- a frame;
- a pleated filter element supported by the frame;
- and
- a substantially planar pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
1 more element
An air filter comprising:
- a frame;
- a pleated filter element supported by the frame;
- and
- a substantially planar woven, plastic mesh supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
1 more element
An air handling unit defining a path of airflow, the unit comprising:
- a filter support;
- and
- a filter assembly supported by the support within the path of airflow through the air handling unit, the filter assembly comprising;
- a frame;
- a pleated filter element supported by the frame, and.
- a substantially planar plastic pre-filter formed from woven plastic strands and supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter.
3 more elements
An air filter comprising:
- a frame;
- a pleated filter element supported by the frame;
- and
- a plastic pre-filter formed from plastic strands supported by the frame in a side-by-side relationship with the pleated filter to filter air which passes through the pleated filter, wherein the plastic strands have different diameters such that the pre-filter has an irregular surface.
1 more element
Dependencies are inferred from the claim text.