Abstract: A refinishing unit comprises an air handling module and a spray booth, both of which may be used separately. An air handling module suitable for use with a spray booth comprises a housing; fresh air inlet means to said housing; first fan means in said housing receiving fresh air from said fresh air inlet means; a heat generator in said housing; a heat exchanger in said housing, associated with said heat generator and through which air drawn in by said first fan means is passed; an outlet for heated air, heated in said heat exchanger, from said housing; an exhaust gas intake into said housing; second fan means in said housing and connected to said exhaust gas intake and outlet means exhausting gas, drawn in through said exhaust gas intake by said second fan means, to atmosphere. The spray booth comprises a roof structure unit and a floor structure unit, the roof structure unit being supported on the floor structure unit at suitable places by means of support columns.