adversely increasing the pressure load whilst limiting the maximum reaction load in the following the effect of the deceleration device 2 on the door will be illustrated it can be seen from the following graph of fig3 that reacting a force normal to door plane at the door centre of area by means of the deceleration device 2 throughout the doors rotation under decompression load will reduce the end energy in particular reacting a load of 50 dan at the door centre of area will reduce the end energy by 8 2684 j to 2473 j reacting a load of 100 dan at the door centre of area will reduce the end energy by 16 2684 j to 2263 j reacting a load of 150 dan at the door centre of area will reduce the end energy by 24 2684 j to 2054 j reacting a load of 200 dan at the door centre of area will reduce the end energy by 32 2684 j to 1840 j reacting a load of 250 dan at the door centre of area will reduce the end energy by 40 2684 j to 1630 j assuming a series of reaction loads as described in the foregoing paragraph the effect of door opening time is shown in fig4 as will become apparent from fig4 reacting a load of 50 dan at the door centre of area increases the time taken to reach the minimum venting are 80 u00b0 by 3 0 067 ms to 0 069 ms reacting a load of 100 dan at the door centre of area increases the time taken to reach the minimum venting area 80 u00b0 by 4 5 0 067 ms to 0 070 ms reacting a load of 150.