Are less likely to collect dust due to the fact that they stand vertically. Since they draw to the side versus lifting and lowering they operate better on doors and windows that also slide from side to side. Generally they require less muscle strength, and are faster to operate. Vertical blinds are available in flat plastic (PVC), fabric, embossed pvc, faux wood materials, metal, wood and also s-curved slats. Stationary vertical blinds are hung in the doorways of some homes and businesses which generally leave the door open. Movement of the blind may signal a change in air flow, or someone entering the doorway. More commonly however, these vertical blinds are made of thick plastic. In the cold rooms of food businesses, this slows the heat leakage into the cold room. In warmer climates, vertical blinds discourage flies and some other insects from entering the building.