They are generally worn with the same types of shirts and accessories as black dinner jackets, though the turndown collar and cummerbund preferred to the wing collar or waistcoat.
Whenever there was a turndown in the market for sewing thread, the overheads due to running numerous mills, each with its own management and administrative structure, was a liability.
If the boiler is of the high efficiency condensing type, high turndown ratios are feasible and the higher the turndown ratio, the more efficient it will be.
