Air curtain on the in side or out ?

[cryotec]

Can u guys help i have never installed one so i want to know should it be installed on the inside or outside of the freezer room? which works best

[install monkey]

outside, check installation instructions, for correct angle too;)

[cryotec]

but there is sliding rail outside?

[install monkey]

mount it above the rail- bit of unistrut maybe to pack it off the door frame

[cryotec]

thanks for help