Product Information Product Name : Maxx Air M-500 LPManufacturer: Enviro-Flo, Inc.Original Certification Date: 03/16/2015Certification Date: 03/16/2015Certification End Date: 03/16/2022Capacity: 500Material: ConcreteType: Aerobic Treatment SystemClass: Class 1 Certifications Certification: Certifications: NSF/ANSI Standard 40 Standard year: 2019 Version Year of Original Standard: 2013SPE#: 272 Approved Approved Aerators: Manufacturer: HiblowModel: HP40Hi Blow model: HP-40 Approved Alarms: Manufacturer: Included on Aerator