HEPA

What it is

HEPA stands for High-Efficiency Particulate Air. A true HEPA filter captures at least 99.97% of particles 0.3 microns in size under standard test conditions. That size is the hardest to catch, so the filter does even better on larger particles like pollen, pet dander and most household dust. In a vacuum, a HEPA filter keeps fine dust and allergens inside the machine instead of blowing them back out into the room.

Why it matters

If anyone in your home has allergies or asthma, or you have pets, filtration makes a noticeable difference to the air during and after vacuuming. Be careful with labels: "HEPA-type," "HEPA-style" and "HEPA-like" aren't the same as true HEPA. The filter also only helps if the vacuum body is sealed, so air can't leak around the filter. Look for "true HEPA" or "sealed HEPA system" in the specs.

Keeping it working

Empty the bin or change the bag before it's full, and clean or replace the filter as the manual says, usually every 6–12 months. A clogged filter reduces suction and makes the motor work harder.

Related

• Cleaning with pets and allergies
• The Complete Guide to Home Cleaning in Mississauga
• Cleaning tools & methods

Source

U.S. EPA: What is a HEPA filter?, based on the U.S. Department of Energy's HEPA specification.