New cab and plant's death...

Yesterday I have built my firs new cab for 400hps.
And as soon as everything has been tested I put my streched plant in to this cab.
For a night time I have switched sucking out fan off and only lampcooling fan was working. I woke up this morning and saw my plant flat down with leafes rolled, gave it a little water and in an hour it was up back, bu leafes are still rolled towards the centre.
Plant was about 20 - 25 inch away from the lamp. The temps probably got high.

You are probably right. Leave the sucking out fan on.

your plant might survive. is it still green? you just need to cool everything down again.