Dryer appliances, methods for diagnosing restrictions in dryer appliance, and blower for dryer appliances are provided. A blower includes a blower fan and a scroll housing including an outer wall, the outer wall defining an interior, the blower fan rotatably mounted within the interior. The scroll housing includes a spiral portion, an outlet portion generally tangentially aligned with the spiral portion, and a cutoff wall extending from the outlet portion into the interior, the cutoff wall including a cutoff tip. The scroll housing further includes a tap aperture defined in the outer wall within a tap region, the tap region defined along a line between the cutoff tip and a joint location between the spiral portion and the outlet portion.