I installed a Kenmore microhood Model 721.80492 about 1.5 years ago and initially wanted to vent it to the outside. I haven't been able to vent the unit to the outside(wife changed her mind) and now I just want to room vent the microhood so it's easier. Well, when I initially set up the unit I used snips and cut out the "knockouts" on the blower plate. Can I still vent the hood into the room or did I totally mess up by cutting out the "knockouts" on the blower plate? Please advise. Thank you