Hi there, The main heater vent is located below the front trim, behind the top portion of the trim. The main intake is also underneath the front trim. The slits/louvers on the sides and back of the fireplace do not vent out heat.
Hi Dino, Thanks for your question. You do not have to leave space inside the wall as our fireplaces are Zero clearance. Let me know if you have any other questions. Thanks, JP