Does the air duct machine need a manhole?

Pipeline fans need to reserve maintenance ports. After the maintenance port is left to the air duct machine, it is more convenient to check and maintain the problems in the later stage. You can ask the master to make a 40×40 hole in the air duct machine, and then cover it with wooden boards or independently make a grille abs tuyere. Duct blower is more suitable for small families or families with sufficient budget. Duct blower not only has comprehensive functions, but also gives consideration to aesthetics. At the same time, cleaning is also very simple, just unscrew the fixing screw. Both the air outlet and the air return outlet have filter screens, and the dust is generally on the filter screen, so it is easy to clean.