You may have to remove a panel to get at it. Clean commercial dryers regularly. Commercial dryers get a lot of use and will have a common venting system. It is extremely important to have the vent systems cleaned regularly. It is odorless and colorless and is highly toxic.
Carbon monoxide is a flammable and potentially explosive gas.
The effects of carbon monoxide range from a mild headache to lethargy and confusion, unconsciousness, and death. Causes of carbon monoxide in a building can include improper combustion or improper ventilation of furnaces fueled by natural gas or oil, water heaters, fireplaces, wood burning stoves, or even from fumes from an automobile running in a garage or in close proximity to a building. A blockage in a chimney or flue pipe can cause carbon monoxide accumulation. Carbon monoxide will also be generated by the extremely dangerous practice of using barbecues, portable stoves, or portable heaters inside a building. The danger of carbon monoxide is that this insidious gas will starve oxygen from the body.