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Vent Cap, End-of-Line

  • vent cap provides protection against environmental impact (harsh weather conditions, bird nests, etc.)
  • cost effective device
  • almost maintenance free
  • certified flow performance curves

Function and Description

The PROTEGO® E/H0 vent cap allows vessels which are not pressurized to vent. This device prevents rain and dirt from entering the vent line. The EH/0 vent cap is not flame transmission proof. It is often used in combination with detonation flame arresters, when those are used in vent lines, installed at a position which creates a long run up distance from the end of the vent line to prevent endurance burning. The PROTEGO® EH/0 vent cap will then be installed at the end of that vent line to prevent particles or rain from entering the line.

The vent cap PROTEGO® EH/0 main components are a housing (1), a weather hood (2) and a protection screen (3). The device is equipped with a fixed weather hood out of metal. The protection screen prevents particles or rain from entering the


To select the nominal size (DN), please use the flow capacity charts on the following pages

DN20 / ¾" 25 / 1" 32 / 1¼" 40 / 1½"50 / 2" 65 / 2½" 80 / 3"
a163 / 6.42163 / 6.42163 / 6.42183 / 7.20183 / 7.20218 / 8.58218 / 8.58
b175 / 6.89175 / 6.89175 / 6.89190 / 7.48190 / 7.48200 / 7.87200 / 7.87
Dimensions in mm / inches

Material selection

Design AB
HousingSteelStainless Steel
Weather hoodSteelStainless Steel
Special materials upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5 CL 150 R.F.
other types upon request

Design Types and Specifications

Following designs are available:

Vent cap, basic design


Special designs available on request

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.