If natural vent is distinguished from the appearance, we can roughly divide them into low-profile ventilator and streamlined natural ventilator. Compared with low-profile natural ventilator, the streamlined natural ventilator has more beautiful appearance and better ventilation effect. Therefore, it is popular in the market.

(1) Suitable range of Mcwell streamlined natural ventilator

Systematic partial air supply is suitable for quiet conditions where the work site is relatively fixed, the radiation intensity is high, and the air temperature is high, and the process does not allow water droplets, or the work site emits harmful gas or dust that does not allow the use of recirculated air.

(2) The systematic local air supply of Mcwell's streamlined natural ventilator is basically same with general centralized air supply system, except that the air supply outlet uses "sprinklers" instead of the usual air supply outlets. The air is processed (usually cooled), sent from the air duct to the vicinity of the work place, and then sent out through the "sprinkler", so that the staff is surrounded by the air that meets the requirements, just like an "air shower". 

The airflow of the natural ventilation system should be obliquely blown from the upper part of the front side of the human body to the upper torso (head, neck, chest) of the human body, so that the upper part of the human body is surrounded by fresh air. If necessary, it can also be blown vertically from top to bottom. The effective airflow width to the human body should be 1 m, and 0.6 m for light work with indoor heat dissipation less than 23 w/m2.
 

(1) Suitable range of Mcwell streamlined natural ventilator