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  • 28405.0-00 Enclosure Pressure Compensation Device M40
  • 28405.0-00 Enclosure Pressure Compensation Device M40

28405.0-00 Enclosure Pressure Compensation Device M40

2.00 LBS
In Stock
Current Stock:

Product Description


  • UL Type 1, 4, 4X & IP 66 protection
  • Semipermeable membrane
  • Easy to install
  • Two sizes - M40 & M12

Pressure differentials in a hermetically sealed enclosure are a result of the heat generated by electrical and electronic components in the enclosure, as well as the fluctuation of the outside temperature. In the case of negative pressure or vacuum, for example, dust and humidity can be absorbed through the door seal and can enter the enclosure.
The DA 284 Vent Plug provides a protected enclosure environment for valuable and crucial components with a UL 4X rated degree of protection. A semipermeable membrane inside the device allows air and humidity to leave the enclosure. In the opposite direction, it only allows dry air into the enclosure while not allowing humidity and dust from the outside to enter.

Mounting thread with nut (see below)
Material plastic, PA66, light grey
Sealing NBR gasket
Filter semipermeable membrane
Operating/storage temperature -49 to +158°F (-45 to 70°C)
Protection type see below
Agency approvals UL File No. E234324
Environmental rating Type 1, 4 and 4X



Make cut-out in enclosure wall of 1.6 inches (40.5+0.5mm) for size M40 or 0.5 inches (12.5+0.5mm) for size M12, and mount vent plug with nut. Make sure that the sealing gasket is placed on the outer side of the enclosure. For optimal pressure compensation, it is recommended to use two devices on opposite sides towards the top of the enclosure.



Part No. Model Thread length (depth in enclosure) Protection type Air permeability¹ 1 packing unit Weight (approx.)
28405.0-00 M40 x 1.5 approx. 16mm IP66 (EN 60529) / IPX9K (EN 40050-9) 1200 liters/hr 2 pieces 3.2 oz. (90g) total
28406.0-00 M12 x 1.5 approx. 10mm IP66 (EN 60529) / IPX9K (EN 40050-9) 120 liters/ hr 2 pieces 0.14 oz. (4g) total


¹) at a pressure difference of min. 70mbar

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Warranty Information

1 Year

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