Manual single blade or multi blade regulating climate action valve regulation

, the structure should be strong, should be flexible, opening and closing of the flange should be consistent with the corresponding material duct.
blade, and scoop out nicely, with pneumatic valve gap should be less than the mm.
and cross-sectional area is greater than. Square meters of climate action valve grouping adjustment should be implemented.
check number: by category, number of spot check %, shall not be less than one.
check method: manual operation, amount of feet, observe the examination.