These economical quality access doors meet SMACNA requirements for systems up to 2" w.g. (500 Pa) and provide quick, simple installation wherever duct access is required; available in 20 sizes to meet all access requirements. Design features include a rugged die-formed 22 ga. (0.85) frame and double skin door panels for extra strength, camlock operation for positive seal and easy opening and notched knock-over tabs for a clean and easy installation.