What precautions should be taken for GH2 vent design concerning temperature?

The vent system should be designed for the temperature at which it operates (ambient for GH2 and Cryogenic for LH2). The outlet of the vent system should be designed for a fire to ensure the mechanical integrity of the vent system. 

The supports should also be designed for these temperatures and the associated expansion and contraction. 

It should be ensured that moisture cannot enter the vent system and freeze plugging the vent system, which may be a single point of failure.