Please choose the correct ending to complete the given sentence: Health: [header] How to choose an air purifier for allergies [title] Choose a room air purifier. [step] This is your only option for an air purifier if your home doesn't have forced-air heating or cooling. These range in weight from 10-20 pounds, have a handle for moving, and stand on the floor or table in the room of choice.

Ending1: [substeps] The air purifier you choose determines how well and evenly you evaporate the air. As with any pesticide, follow the safety guidelines laid out above. Ending2: They generally cost less than whole-house models, ranging anywhere from $60 to a couple hundred dollars. [substeps] Room air purifiers require annual replacement of the filter that captures airborne particles responsible for allergies. Ending3: Based on your need, you'll need more than one " air purifier ". [title] Evaluate your own preference for air purifiers. Ending4: Air purifiers have opened into a room and cover the salt and temperature controls it effectively. Your child can use a secure sink, stove, or other portable container to submerge their meat.

Answer format: ending1/ending2/ending3/ending4