Under most commercial leases—and applicable building codes—the landlord is generally responsible for installing and maintaining fire protection, including smoke detector and sprinkler systems.

But commercial tenants are usually responsible for maintaining smoke and carbon monoxide detectors within their leased premises, including testing the devices regularly and changing the batteries when necessary. Commercial tenants also generally have a responsibility not to obstruct or hinder fire escape routes or to create or maintain fire hazards within the leased premises.

In Alabama, the responsibility for fire protection in commercial properties is typically divided between landlords and tenants. Landlords are generally required to install and maintain fire protection systems, such as smoke detectors and sprinkler systems, in accordance with building codes and the terms of the commercial lease. This is to ensure the safety and compliance of the building as a whole. On the other hand, commercial tenants have the responsibility to maintain the smoke and carbon monoxide detectors within their specific leased premises. This includes regular testing and battery replacement to ensure the devices are operational. Additionally, tenants must avoid obstructing fire escape routes and should not create or allow fire hazards to persist in their leased space. Both parties' responsibilities are usually outlined in the lease agreement and are enforced under state statutes and local building codes to ensure public safety and compliance with fire safety regulations.