Combined Hydrocarbon Ozone Catalyst (CHOC4)

Cabin odors caused by jet fuel, oil, deicing agents and engine exhaust can be unpleasant for passengers and expensive for airlines.

Honeywell’s fourth generation Combined Hydrocarbon and Ozone Catalyst (CHOC4) solves the “smell in cabin” problem that causes operational disruptions. According to industry estimates, odor-related disruptions like unscheduled maintenance, return-to-gate incidents and on-time performance issues cost a typical airline more than $1.7 million a year. 

VOCs and oil particulates cause unpleasant cabin odors when they contact hot surfaces on the aircraft. CHOC4 technology neutralizes odors by converting VOCs and oil to harmless byproducts.

Depending on temperature, CHOC4 removes as much as 80 to 90% of the VOCs found in the bleed air introduced to the aircraft cabin during flight and about 50% of VOCs when the aircraft is on the ground. Conventional ozone converters don’t address the problem of cabin odors, and most other dual-function converters remove less than 30% of odors.

The CHOC4 is an upgrade to current ozone converters flying on Airbus A320 and Airbus A330 340 aircraft. Honeywell can economically replace the existing core with a new offset-fin matrix infused with Honeywell’s proprietary catalyst. The re-coring process improves the converter’s odor-removing effectiveness almost threefold and extends its service life considerably.