The Grieve Corp.’s No. 885 is a 1,400-degree F electric, inert atmosphere tempering furnace for heat treating weldments at the customer’s facility. Workspace dimensions measure 24 in. by 36 in. by 24 in. The furnace has 7-in.-thick insulated walls, comprising 1 in. of 2,300-degree F ceramic fiber blanket, 2 in. of 1,700-degree F ceramic fiber blanket, 2 in. of block insulation and 2 in. of rockwool insulation. The 6 1/2-in.-thick furnace floor comprises 4 1/2 in. of 2,300-degree F firebrick and 2 in. of block insulation.