Krueger’s 7000 series combination supply/return diffusers are designed to provide quick single point air distribution for rooftop air conditioning packages and are commonly used in department stores, strip malls, and restaurants. The 7000 series can be mounted in plaster or standard T-bar ceilings and feature an optional factory mounted supply plenum with mounting supports and turning vane, which further simplifies installation. Plenums serving 5 tons or less capacity packages are made of molded fiberglass and plenums for units serving 7.5 tons or less capacity packages are made of duct board fiberglass. Larger sizes are constructed of sheet metal. All optional plenums are insulated.