Hope you ordered a good A/C unit. The EC one is renowned to be C.R.A.P. and heavy. The Metro unit is about half the weight and twice the output with no restriction in use while taking off or landing. The EC Unit is electric made by Keith and the Metro mechanical off the MGB.
Thats what the two big holes are under the Port exhaust ejector. The A/C unit is very simple with no electronics OFF/ON/RESET Fan Speed HIGH/LOW.
Evaporator in the front and one in the back. Works OK up to 43C so far.
If you ordered MEGHAS the screens generate a lot of heat as does the VEMD and CAD. Forced air ventilation is dismal on this aircraft and with any sliding windows open its pretty noisy.
Who/what is "fish"?