Remove the specification on all the 6 the input nodes. The properties window and the schematic show the position of node 1.
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Add some pipes to represent the in-bleeds. Note that the pipes should be short (in order to reduce the pressure drop to a negligible value) but place the appropriate device fittings. As a consequence of this, the pressure drop in the in-bleed would be almost exclusively the pressure loss in the device fitting.
Then insert the device fitting which we have called Gbox 1,4 as a fitting on pipe 12.
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In order to save time copy/paste attributes as shown below.
Copy and paste the attributes of pipe 12 to pipe 15
Repeat this procedure for all glove boxes taking care to insert the correct device fitting.
Note that the inlet pressure of the in-bleed system would be 0 PaG because it is open to atmosphere. So set the specifications at the input nodes to 0 PaG. It is possible to input the specification to one input node and the copy and paste to the others because they all have a value of 0 PaG.
We can also this step to select the fan. The fan should be such that Glove Box has an air flow rate of 220 m3/hr. This will give us the suction pressure, which needs to be generated by the fan at its inlet, namely node 12. For this reason node 12 simply defined as an output node without any specification.
From the above schematic we can see that the fan should generate a suction pressure of -91.41 Pa G at a flow rate of 1321.19 m3/hr.
Let us assume that the fan selected has the following characteristic.
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