It’s advisable to clean or replace your home’s air filters and screens at least once a year to help keep your indoor environment safe from mold, dust mites and other allergens. But don’t stop at your heating, ventilation and cooling/ air-conditioning systems. Think of all the other filters and screens that need cleaning, such as those in humidifiers, range hoods, bathroom fans, and windows. Unfortunately, homeowners often neglect to clean or replace their range hood filters. This can lead to a thick buildup of greasy residue that could easily compromise the important function of removing cooking gases, odors and humidity from the stove-top area. The result can be unhealthy air trapped in your kitchen, not to mention an accumulation of a thin film on your walls, ceilings and counter-tops. Likewise, bathroom fans and window screens can trap layers of dust over time that will hinder the free flow of air to and from the rooms you want to have well ventilated.