Furnace breathing filter

Details Furnace breathing filter Furnace breathing filter

1994-07-05

1995-09-19

Joyce, Harold

Ventilation

Chimney or stack

Chimneytop or stacktop structure

55505, 126 85B, 454 8, F23L 1702

Patent

active

054511836

ABSTRACT:
A furnace breathing filter protects the air inlet and exhaust gas outlet tubes of high-efficiency furnaces from plugging while enabling adequate gas flow. The furnace breathing filter comprises a filter section and a hub. The hub is designed to be inserted into and secured to a fitting on the outdoor end of the furnace tube. The filter section has a grid of openings that are sufficiently large to enable adequate gas passage but small enough to block entry of foreign materials into the furnace tube. The hub may be joined integrally with the filter section, or it maybe a separate piece that is removably assembled to the filter section. The hubs are made with different outer diameters to suit different sized furnace tubes. In an alternate design, the hub fits over the furnace tube fitting.

REFERENCES:
patent: D249955 (1978-10-01), Vogelsang
patent: 2524588 (1950-10-01), Bechtel
patent: 2811095 (1957-10-01), Moran
patent: 2878744 (1959-03-01), Silverman

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