This large diffuser will scent up to 15,000 square feet in HVAC It is ideal for hotel lobbies, stores, large office spaces, healthcare facilities, gyms, or schoolsThe Versa unit is installed in your HVAC system within a matter of minutes All you need is a drill, and a screwdriver, but hiring a professional is recommendedCreate a welcoming and memorable environment in your large spaceAccommodates two 16 oz bottles of our premium fragrance oil or allnatural essential oils not includedStraightforward settings for up to four desired fragrance scenesMay be installed in any HVAC system or via two ports to disperse fragrance easily and efficientlySimple to change fragrances or essential oilsColdair diffusion technologyFull line of FMATIC fragrances essential oils