communicate between multiple boards

[a.demenev@limeup.ru]

i need:
1) switch on vent when in2 OR in15 is on

create 2 ifttt command for these:
ifttt-1: IF in2=true THEN DO on-1
ifttt-2: IF in15=true THEN DO on-1

2) switch off vent when in2 AND in15 is off    create by one IFTTT command, enable "AND" logical.

Hi!
i tried your solution with same result as before: both "on" rules work fine, "off" rule doesn't work