Track how air quality varies across the U.S. and what that means for the air we breathe every day.
Real-Time Air Quality Index
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Air Quality Index
Good (0-50)
Moderate (51-100)
Unhealthy for Sensitive Groups (101-150)
Unhealthy (151-200)
Very Unhealthy (201-300)
Hazardous (300+)
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Full History
1937
Founded in Detroit
General is founded by Art and Grace Redner in Detroit, Michigan, marking the beginning of a family legacy.
1939
Supporting the War Effort
General begins manufacturing filters for bomber ground support equipment during World War II.
1943
Expanding Operations
General moves to a new Detroit location at Schoolcraft and Grand River.
1946
New Detroit Home
General relocates to 12890 Westwood Avenue in Detroit, strengthening operations in Michigan.
1948
Growth into Canada
Canadian General Filters Ltd. is founded, extending reach to North America.
1953
Relocation to Novi, Michigan
General Filters moved to its current location in Novi, Michigan, marking a major milestone in its evolution as a manufacturing company.
1958
Model 250 Humidifier Introduced
The Model 250 set a new standard for whole-home comfort, helping families maintain healthy humidity and improve indoor air quality.
1962
New Oil Filters Introduced
1969
Model 1040 Humidifier Debuts
General Filters introduced the Model 1040 humidifier, a breakthrough product that helped define whole-house humidification.
1983
AC 1 Air Cleaner Introduced
General Filters introduced the Model 1040 humidifier, a breakthrough product that helped define whole-house humidification.
1997
Steam Humidifiers Introduced
The GeneralAire Model 5500 provides clean, sterile moisture with a furnace-independent design, disposable cylinder, digital diagnostics, and included humidistat.
2006
Gar-Ber® Acquisition
Gar-Ber Spin-On residential fuel oil filters were acquired by General Filters and continue to be manufactured to the same trusted specifications.
2006
Elite Humidifiers Introduced
2009
Advanced TERSus Technology Introduced
2014
Dehumidification Expansion
The acquisition of Air & Energy Products expanded the company’s whole-house dehumidifier offerings.
2018
Advanced Air Solutions
Wi-Fi-enabled dehumidifiers were introduced under the GeneralAire® brand, and Second Wind™ Air Purifiers were acquired to expand UV air purification solutions.
2018
Touch Screen & Wi-Fi Control
GeneralAire DH75 and DH100 whole-house dehumidifiers (75-100 pints/day) feature LCD touch screens and Wi-Fi capability via the GeneralAire App for remote monitoring.
2019
Touch Screen & Wi-Fi Control
GeneralAire DH75 and DH100 whole-house dehumidifiers (75-100 pints/day) feature LCD touch screens and Wi-Fi capability via the GeneralAire App for remote monitoring.
2020
Model 5500 Steam Humidifier Introduced
2020
Brand Logo Refresh
New GeneralAire®, General Filters, and Canadian General Filters Brand Logos Introduced
2020
Model 3200 Evaporative Humidifier Introduced
2020
Model 4200 Evaporative Humidifier Introduced
2020
Industry Standard Vapor Pad Lineup Introduced
2021
BioGaskets Included in All Gar-Ber Oil Products
2021
Introduced MERV 13 Filters
2023
Model 4400A Fan-Assist Evaporative Humidifier Introduced
