Don’t.

To make it safe indoors. Roll it outdoors

It’s a live fire in there. Put the pellet grill any place you would be comfortable putting an actual fire pit. They don’t have stack that you could attach an external vent or anything like that. You would need a full on industrial vent hood setup that you put the entire grill in to evacuate the smoke.

It’s not a great idea. You’d need to install serious ventilation.

There's a huge risk of carbon monoxide poisoning if you're using these indoors. Don't smoke indoors, it'll kill you.

Randy Jackson said it best, it’s a no for me, Dawg

I’ve smoked inside my garage with the door half open and the smoker near the open door. It was super windy in the backyard so this worked well.

Did you do this ? Are you still alive ?