DongGuan Tech Free Air Conditioning Mfy.Ltd.
  Address: No. 11, Dakei Industrial Zone, Shi Pai
  Town, Dongguan City, Guangdong Province.
  Tel: (0769) 8652 0328
  Fax: (0769) 8652 1288
Positive pressure door



The positive pressure door is designed with a concave inner push, which is using the inside positive pressure extrude the door panel, together with the door sealing rubber strip to ensure the air tightness. Functionally, it’s double insurance effect. Currently, TECH FREE has applied for this patented invention to whole series product. 

Positive pressure doors are divided into the following two styles:

Inward push