This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to choose an air purifier for allergies
Choose a room air purifier.
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.

Choices: *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.. *They generally cost less than whole-house models, ranging anywhere from $60 to a couple hundred dollars. Room air purifiers require annual replacement of the filter that captures airborne particles responsible for allergies.. *Based on your need, you'll need more than one " air purifier ". Evaluate your own preference for air purifiers.. *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..
The answer is:
They generally cost less than whole-house models, ranging anywhere from $60 to a couple hundred dollars. Room air purifiers require annual replacement of the filter that captures airborne particles responsible for allergies.