CONVECTION OF HEAT IN AIR APPARATUS – GUPTA BRAND 8006060 Posted on February 20, 2017May 1, 2017 by admin Metal box, 230 x 75 x 75 mm, with sliding glass front and two detachable glass chimneys, with one candle holder under left chimney. Supplied without candles. Spark in mm : 25, 50, 75, 100